Question 40 of 40 | 0.0/ 2.5 Points |
The following data were analyzed using one-way analysis of variance. | A | B | C | | 34 | 27 | 19 | | 26 | 23 | 31 | | 31 | 29 | 22 | | 28 | 21 | 22 |
Which one of the following statements is correct? A. The purpose of the analysis is to determine whether the groups A, B, and C are independent. | | B. The purpose of the analysis is to test the hypothesis that the population means of the three groups are equal. | | C. The purpose of the analysis is to test the hypothesis that the population variances of the three groups are equal. | | D. The purpose of the analysis is to test the hypothesis that the sample means of the three groups are equal. | |
The distribution of B.A. degrees conferred by a local college is listed below, by major. Major Frequency
English 2073 Mathematics 2164 Chemistry 318 Physics 856 Liberal Arts 1358 Business 1676 Engineering 868
9313 What is the probability that a randomly selected degree is not in Business?
A. 0.7800 | | B. 0.8200 | | C. 0.8300 | | D. 0.9200 | |
| Question 7 of 40 | 2.5/ 2.5 Points |
The probability that Luis will pass his statistics test is 0.94. Find the probability that he will fail his statistics test. A. 0.02 | | B. 0.05 | | C. 0.94 | | D. 0.06 | |
| Question 8 of 40 | 2.5/ 2.5 Points |
Suppose you have an extremely unfair coin: the probability of a head is 1/5, and the probability of a tail is 4/5. If you toss the coin 40 times, how many heads do you expect to see? | Question 9 of 40 | 2.5/ 2.5 Points |
A committee of three people is to be formed. The three people will be selected from a list of five possible committee members. A simple random sample of three people is taken, without replacement, from the group of five people. Using the letters A, B, C, D, E to represent the five people, list the possible samples of size three and use your list to determine the probability that B is included in the sample. (Hint: There are 10 possible samples.) A. 0.6 | | B. 0.4 | | C. 0.7 | | D. 0.8 | |
| Question 10 of 40 | 0.0/ 2.5 Points |
If a person is randomly selected, find the probability that his or her birthday is not in May. Ignore leap years. There are 365 days in a year. Express your answer as a fraction. A. 335/365 | | B. 334/365 | | C. 336/365 | | D. 30/365 | |
| Question 11 of 40 | 2.5/ 2.5 Points |
A bag contains four chips of which one is red, one is blue, one is green, and one is yellow. A chip is selected at random from the bag and then replaced in the bag. A second chip is then selected at random. Make a list of the possible outcomes (for example, RB represents the outcome red chip followed by blue chip) and use your list to determine the probability that the two chips selected are the same color. (Hint: There are 16 possible outcomes.) A. 1/4 | | B. 3/4 | | C. 2/16 | | D. 3/16 | |
| Question 12 of 40 | 0.0/ 2.5 Points |
If you flip a coin three times, the possible outcomes are HHH, HHT, HTH, HTT, THH, THT, TTH, TTT. What is the probability that at least two heads occur consecutively? A. 1/8 | | B. 3/8 | | C. 5/8 | | D. 6/8 | |
| Question 13 of 40 | 0.0/ 2.5 Points |
In the first series of rolls of a die, the number of odd numbers exceeded the number of even numbers by 5. In the second series of rolls of the same die, the number of odd numbers exceeded the number of even numbers by 11. Determine which series is closer to the 50/50 ratio of odd/even expected of a fairly rolled die. A. The second series is closer because the difference between odd and even numbers is greater than the difference for the first series. | | B. The first series is closer because the difference between odd and even numbers is less than the difference for the second series. | | C. Since 1/2 > 1/5 > 1/11, the first series is closer. | | D. The series closer to the theoretical 50/50 cannot be determined unless the total number of rolls for both series is given. | |
| Question 14 of 40 | 2.5/ 2.5 Points |
A bag contains 4 red marbles, 3 blue marbles, and 7 green marbles. If a marble is randomly selected from the bag, what is the probability that it is blue? A. 2/11 | | B. 3/11 | | C. 5/14 | | D. 3/14 | |
| Question 15 of 40 | 0.0/ 2.5 Points |
Sammy and Sally each carry a bag containing a banana, a chocolate bar, and a licorice stick. Simultaneously, they take out a single food item and consume it. The possible pairs of food items that Sally and Sammy consumed are as follows. chocolate bar - chocolate bar licorice stick - chocolate bar banana - banana chocolate bar - licorice stick licorice stick - licorice stick chocolate bar – banana banana - licorice stick licorice stick - banana banana - chocolate bar Find the probability that no chocolate bar was eaten. A. 4/9 | | B. 5/9 | | C. 7/9 | | D. 5/8 | |
| Question 16 of 40 | 2.5/ 2.5 Points |
If you flip a coin three times, the possible outcomes are HHH, HHT, HTH, HTT, THH, THT, TTH, TTT. What is the probability of getting at least two tails? A. 1/2 | | B. 2/3 | | C. 3/4 | | D. 4/9 | |
| Question 17 of 40 | 2.5/ 2.5 Points |
A sample space consists of 46 separate events that are equally likely. What is the probability of each? A. 1/24 | | B. 1/46 | | C. 1/32 | | D. 1/18 | |
| Question 18 of 40 | 2.5/ 2.5 Points |
Suppose you pay $1.00 to roll a fair die with the understanding that you will get back $3.00 for rolling a 5 or a 2, nothing otherwise. What is your expected value? A. $1.00 | | B. $0.00 | | C. $3.00 | | D. −$1.00 | |
| Question 19 of 40 | 0.0/ 2.5 Points |
A study of 600 college students taking Statistics 101 revealed that 54 students received the grade of A. Typically 10% of the class gets an A. The difference between this group of students and the expected value is not significant at the 0.05 level. What does this mean in this case? A. The probability that the difference occurred due to chance is less than 0.05. | | B. The probability of getting an A is 10% and only 9% got an A in this study. The difference is less than 5% so it is not significant. | | C. There is not enough information to make any conclusion. | | D. The probability that the difference occurred due to chance is more than 0.05. | |
| Question 20 of 40 | 0.0/ 2.5 Points |
A 28-year-old man pays $125 for a one-year life insurance policy with coverage of $140,000. If the probability that he will live through the year is 0.9994, to the nearest dollar, what is the man’s expected value for the insurance policy? A. $139,916 | | B. −$41 | | C. $84 | | D. −$124 | |
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| | Part 2 of 2 - | 0.0/ 50.0 Points |
Question 21 of 40 | 0.0/ 2.5 Points |
Which point below would be an outlier if it were on the following graph?
A. (25, 20) | | B. (5, 12) | | C. (7, 5) | | D. (5, 3) | |
| Question 22 of 40 | 0.0/ 2.5 Points |
Among a random sample of 500 college students, the mean number of hours worked per week at non-college related jobs is 14.6. This mean lies 0.4 standard deviations below the mean of the sampling distribution. If a second sample of 500 students is selected, what is the probability that for the second sample, the mean number of hours worked will be less than 14.6? A. 0.5 | | B. 0.6179 | | C. 0.6554 | | D. 0.3446 | |
| Question 23 of 40 | 0.0/ 2.5 Points |
The scatter plot and best-fit line show the relation among the number of cars waiting by a school (y) and the amount of time after the end of classes (x) in arbitrary units. The correlation coefficient is -0.55. Determine the amount of variation in the number of cars not explained by the variation time after school.
A. 55% | | B. 70% | | C. 30% | | D. 45% | |
| Question 24 of 40 | 0.0/ 2.5 Points |
Among a random sample of 150 employees of a particular company, the mean commute distance is 29.6 miles. This mean lies 1.2 standard deviations above the mean of the sampling distribution. If a second sample of 150 employees is selected, what is the probability that for the second sample, the mean commute distance will be less than 29.6 miles? A. 0.8849 | | B. 0.5 | | C. 0.1131 | | D. 0.1151 | |
| Question 25 of 40 | 0.0/ 2.5 Points |
A researcher wishes to estimate the proportion of college students who cheat on exams. A poll of 560 college students showed that 27% of them had, or intended to, cheat on examinations. Find the 95% confidence interval. A. 0.2323 to 0.3075 | | B. 0.2325 to 0.3075 | | C. 0.2325 to 0.3185 | | D. 0.2323 to 0.3185 | |
| Question 26 of 40 | 0.0/ 2.5 Points |
Which line of the three shown in the scatter diagram below fits the data best?
A. A | | B. B | | C. C | | D. All the lines are equally good | |
| Question 27 of 40 | 0.0/ 2.5 Points |
Which graph has two groups of data, correlations within each group, but no correlation among all the data? | Question 28 of 40 | 0.0/ 2.5 Points |
A researcher wishes to estimate the mean amount of money spent per month on food by households in a certain neighborhood. She desires a margin of error of $30. Past studies suggest that a population standard deviation of $248 is reasonable. Estimate the minimum sample size needed to estimate the population mean with the stated accuracy. A. 274 | | B. 284 | | C. 264 | | D. 272 | |
| Question 29 of 40 | 0.0/ 2.5 Points |
Select the best fit line on the scatter diagram below.
A. A | | B. B | | C. C | | D. All of the lines are equally good | |
| Question 30 of 40 | 0.0/ 2.5 Points |
Select the best fit line on the scatter diagram below.
A. A | | B. B | | C. C | | D. None of the lines is the line of best fit | |
| Question 31 of 40 | 0.0/ 2.5 Points |
A random sample of 30 households was selected from a particular neighborhood. The number of cars for each household is shown below. Estimate the mean number of cars per household for the population of households in this neighborhood. Give the 95% confidence interval.
A. 1.14 to 1.88 | | B. 1.12 to 1.88 | | C. 1.12 to 1.98 | | D. 1.14 to 1.98 | |
| Question 32 of 40 | 0.0/ 2.5 Points |
The graph shows a measure of fitness (y) and miles walked weekly. Identify the probable cause of the correlation.
A. The correlation is coincidental. | | B. There is a common underlying cause of the correlation. | | C. There is no correlation between the variables. | | D. Walking is a direct cause of the fitness. | |
| Question 33 of 40 | 0.0/ 2.5 Points |
Monthly incomes of employees at a particular company have a mean of $5954. The distribution of sample means for samples of size 70 is normal with a mean of $5954 and a standard deviation of $259. Suppose you take a sample of size 70 employees from the company and find that their mean monthly income is $5747. How many standard deviations is the sample mean from the mean of the sampling distribution? A. 0.8 standard deviations above the mean | | B. 0.8 standard deviations below the mean | | C. 7.3 standard deviations below the mean | | D. 207 standard deviations below the mean | |
| Question 34 of 40 | 0.0/ 2.5 Points |
Suggest the cause of the correlation among the data.
The graph shows strength of coffee (y) and number of scoops used to make 10 cups of coffee (x). Identify the probable cause of the correlation. A. The variation in the x variable is a direct cause of the variation in
the y variable. | | B. There is no correlation between the variables. | | C. The correlation is due to a common underlying cause. | | D. The correlation between the variables is coincidental. | |
| Question 35 of 40 | 0.0/ 2.5 Points |
A sample of 64 statistics students at a small college had a mean mathematics ACT score of 28 with a standard deviation of 4. Estimate the mean mathematics ACT score for all statistics students at this college. Give the 95% confidence interval. A. 28.0 to 30.0 | | B. 25.0 to 27.0 | | C. 29.0 to 31.0 | | D. 27.0 to 29.0 | |
| Question 36 of 40 | 0.0/ 2.5 Points |
30% of the fifth grade students in a large school district read below grade level. The distribution of sample proportions of samples of 100 students from this population is normal with a mean of 0.30 and a standard deviation of 0.045. Suppose that you select a sample of 100 fifth grade students from this district and find that the proportion that reads below grade level in the sample is 0.36. What is the probability that a second sample would be selected with a proportion less than 0.36? A. 0.8932 | | B. 0.8920 | | C. 0.9032 | | D. 0.9048 | |
| Question 37 of 40 | 0.0/ 2.5 Points |
Of the 6796 students in one school district, 1537 cannot read up to grade level. Among a sample of 812 of the students from this school district, 211 cannot read up to grade level. Find the sample proportion of students who cannot read up to grade level. A. 0.14 | | B. 0.26 | | C. 211 | | D. 0.23 | |
| Question 38 of 40 | 0.0/ 2.5 Points |
A population proportion is to be estimated. Estimate the minimum sample size needed to achieve a margin of error E = 0.01with a 95% degree of confidence. A. 7,000 | | B. 8,000 | | C. 9,000 | | D. 10,000 | |
| Question 39 of 40 | 0.0/ 2.5 Points |
The scatter plot and best-fit line show the relation between the price per item (y) and the availability of that item (x) in arbitrary units. The correlation coefficient is -0.95. Determine the amount of variation in pricing explained by the variation in availability.
A. 5% | | B. 10% | | C. 95% | | D. 90% | |
| Question 40 of 40 | 0.0/ 2.5 Points |
In a poll of 400 voters in a certain state, 61% said that they opposed a voter ID bill that might hinder some legitimate voters from voting. The margin of error in the poll was reported as 4 percentage points (with a 95% degree of confidence). Which statement is correct? A. The reported margin of error is consistent with the sample size. | | B. There is not enough information to determine whether the margin of error is consistent with the sample size. | | C. The sample size is too small to achieve the stated margin of error. | | D. For the given sample size, the margin of error should be smaller than stated. | |
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The distribution of B.A. degrees conferred by a local college is listed below, by major. Major Frequency
English 2073 Mathematics 2164 Chemistry 318 Physics 856 Liberal Arts 1358 Business 1676 Engineering 868
9313 What is the probability that a randomly selected degree is not in Business?
A. 0.7800 | | B. 0.8200 | | C. 0.8300 | | D. 0.9200 | |
| Question 7 of 40 | 2.5/ 2.5 Points |
The probability that Luis will pass his statistics test is 0.94. Find the probability that he will fail his statistics test. A. 0.02 | | B. 0.05 | | C. 0.94 | | D. 0.06 | |
| Question 8 of 40 | 2.5/ 2.5 Points |
Suppose you have an extremely unfair coin: the probability of a head is 1/5, and the probability of a tail is 4/5. If you toss the coin 40 times, how many heads do you expect to see? | Question 9 of 40 | 2.5/ 2.5 Points |
A committee of three people is to be formed. The three people will be selected from a list of five possible committee members. A simple random sample of three people is taken, without replacement, from the group of five people. Using the letters A, B, C, D, E to represent the five people, list the possible samples of size three and use your list to determine the probability that B is included in the sample. (Hint: There are 10 possible samples.) A. 0.6 | | B. 0.4 | | C. 0.7 | | D. 0.8 | |
| Question 10 of 40 | 0.0/ 2.5 Points |
If a person is randomly selected, find the probability that his or her birthday is not in May. Ignore leap years. There are 365 days in a year. Express your answer as a fraction. A. 335/365 | | B. 334/365 | | C. 336/365 | | D. 30/365 | |
| Question 11 of 40 | 2.5/ 2.5 Points |
A bag contains four chips of which one is red, one is blue, one is green, and one is yellow. A chip is selected at random from the bag and then replaced in the bag. A second chip is then selected at random. Make a list of the possible outcomes (for example, RB represents the outcome red chip followed by blue chip) and use your list to determine the probability that the two chips selected are the same color. (Hint: There are 16 possible outcomes.) A. 1/4 | | B. 3/4 | | C. 2/16 | | D. 3/16 | |
| Question 12 of 40 | 0.0/ 2.5 Points |
If you flip a coin three times, the possible outcomes are HHH, HHT, HTH, HTT, THH, THT, TTH, TTT. What is the probability that at least two heads occur consecutively? A. 1/8 | | B. 3/8 | | C. 5/8 | | D. 6/8 | |
| Question 13 of 40 | 0.0/ 2.5 Points |
In the first series of rolls of a die, the number of odd numbers exceeded the number of even numbers by 5. In the second series of rolls of the same die, the number of odd numbers exceeded the number of even numbers by 11. Determine which series is closer to the 50/50 ratio of odd/even expected of a fairly rolled die. A. The second series is closer because the difference between odd and even numbers is greater than the difference for the first series. | | B. The first series is closer because the difference between odd and even numbers is less than the difference for the second series. | | C. Since 1/2 > 1/5 > 1/11, the first series is closer. | | D. The series closer to the theoretical 50/50 cannot be determined unless the total number of rolls for both series is given. | |
| Question 14 of 40 | 2.5/ 2.5 Points |
A bag contains 4 red marbles, 3 blue marbles, and 7 green marbles. If a marble is randomly selected from the bag, what is the probability that it is blue? A. 2/11 | | B. 3/11 | | C. 5/14 | | D. 3/14 | |
| Question 15 of 40 | 0.0/ 2.5 Points |
Sammy and Sally each carry a bag containing a banana, a chocolate bar, and a licorice stick. Simultaneously, they take out a single food item and consume it. The possible pairs of food items that Sally and Sammy consumed are as follows. chocolate bar - chocolate bar licorice stick - chocolate bar banana - banana chocolate bar - licorice stick licorice stick - licorice stick chocolate bar – banana banana - licorice stick licorice stick - banana banana - chocolate bar Find the probability that no chocolate bar was eaten. A. 4/9 | | B. 5/9 | | C. 7/9 | | D. 5/8 | |
| Question 16 of 40 | 2.5/ 2.5 Points |
If you flip a coin three times, the possible outcomes are HHH, HHT, HTH, HTT, THH, THT, TTH, TTT. What is the probability of getting at least two tails? A. 1/2 | | B. 2/3 | | C. 3/4 | | D. 4/9 | |
| Question 17 of 40 | 2.5/ 2.5 Points |
A sample space consists of 46 separate events that are equally likely. What is the probability of each? A. 1/24 | | B. 1/46 | | C. 1/32 | | D. 1/18 | |
| Question 18 of 40 | 2.5/ 2.5 Points |
Suppose you pay $1.00 to roll a fair die with the understanding that you will get back $3.00 for rolling a 5 or a 2, nothing otherwise. What is your expected value? A. $1.00 | | B. $0.00 | | C. $3.00 | | D. −$1.00 | |
| Question 19 of 40 | 0.0/ 2.5 Points |
A study of 600 college students taking Statistics 101 revealed that 54 students received the grade of A. Typically 10% of the class gets an A. The difference between this group of students and the expected value is not significant at the 0.05 level. What does this mean in this case? A. The probability that the difference occurred due to chance is less than 0.05. | | B. The probability of getting an A is 10% and only 9% got an A in this study. The difference is less than 5% so it is not significant. | | C. There is not enough information to make any conclusion. | | D. The probability that the difference occurred due to chance is more than 0.05. | |
| Question 20 of 40 | 0.0/ 2.5 Points |
A 28-year-old man pays $125 for a one-year life insurance policy with coverage of $140,000. If the probability that he will live through the year is 0.9994, to the nearest dollar, what is the man’s expected value for the insurance policy? A. $139,916 | | B. −$41 | | C. $84 | | D. −$124 | |
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| | Part 2 of 2 - | 0.0/ 50.0 Points |
Question 21 of 40 | 0.0/ 2.5 Points |
Which point below would be an outlier if it were on the following graph?
A. (25, 20) | | B. (5, 12) | | C. (7, 5) | | D. (5, 3) | |
| Question 22 of 40 | 0.0/ 2.5 Points |
Among a random sample of 500 college students, the mean number of hours worked per week at non-college related jobs is 14.6. This mean lies 0.4 standard deviations below the mean of the sampling distribution. If a second sample of 500 students is selected, what is the probability that for the second sample, the mean number of hours worked will be less than 14.6? A. 0.5 | | B. 0.6179 | | C. 0.6554 | | D. 0.3446 | |
| Question 23 of 40 | 0.0/ 2.5 Points |
The scatter plot and best-fit line show the relation among the number of cars waiting by a school (y) and the amount of time after the end of classes (x) in arbitrary units. The correlation coefficient is -0.55. Determine the amount of variation in the number of cars not explained by the variation time after school.
A. 55% | | B. 70% | | C. 30% | | D. 45% | |
| Question 24 of 40 | 0.0/ 2.5 Points |
Among a random sample of 150 employees of a particular company, the mean commute distance is 29.6 miles. This mean lies 1.2 standard deviations above the mean of the sampling distribution. If a second sample of 150 employees is selected, what is the probability that for the second sample, the mean commute distance will be less than 29.6 miles? A. 0.8849 | | B. 0.5 | | C. 0.1131 | | D. 0.1151 | |
| Question 25 of 40 | 0.0/ 2.5 Points |
A researcher wishes to estimate the proportion of college students who cheat on exams. A poll of 560 college students showed that 27% of them had, or intended to, cheat on examinations. Find the 95% confidence interval. A. 0.2323 to 0.3075 | | B. 0.2325 to 0.3075 | | C. 0.2325 to 0.3185 | | D. 0.2323 to 0.3185 | |
| Question 26 of 40 | 0.0/ 2.5 Points |
Which line of the three shown in the scatter diagram below fits the data best?
A. A | | B. B | | C. C | | D. All the lines are equally good | |
| Question 27 of 40 | 0.0/ 2.5 Points |
Which graph has two groups of data, correlations within each group, but no correlation among all the data? | Question 28 of 40 | 0.0/ 2.5 Points |
A researcher wishes to estimate the mean amount of money spent per month on food by households in a certain neighborhood. She desires a margin of error of $30. Past studies suggest that a population standard deviation of $248 is reasonable. Estimate the minimum sample size needed to estimate the population mean with the stated accuracy. A. 274 | | B. 284 | | C. 264 | | D. 272 | |
| Question 29 of 40 | 0.0/ 2.5 Points |
Select the best fit line on the scatter diagram below.
A. A | | B. B | | C. C | | D. All of the lines are equally good | |
| Question 30 of 40 | 0.0/ 2.5 Points |
Select the best fit line on the scatter diagram below.
A. A | | B. B | | C. C | | D. None of the lines is the line of best fit | |
| Question 31 of 40 | 0.0/ 2.5 Points |
A random sample of 30 households was selected from a particular neighborhood. The number of cars for each household is shown below. Estimate the mean number of cars per household for the population of households in this neighborhood. Give the 95% confidence interval.
A. 1.14 to 1.88 | | B. 1.12 to 1.88 | | C. 1.12 to 1.98 | | D. 1.14 to 1.98 | |
| Question 32 of 40 | 0.0/ 2.5 Points |
The graph shows a measure of fitness (y) and miles walked weekly. Identify the probable cause of the correlation.
A. The correlation is coincidental. | | B. There is a common underlying cause of the correlation. | | C. There is no correlation between the variables. | | D. Walking is a direct cause of the fitness. | |
| Question 33 of 40 | 0.0/ 2.5 Points |
Monthly incomes of employees at a particular company have a mean of $5954. The distribution of sample means for samples of size 70 is normal with a mean of $5954 and a standard deviation of $259. Suppose you take a sample of size 70 employees from the company and find that their mean monthly income is $5747. How many standard deviations is the sample mean from the mean of the sampling distribution? A. 0.8 standard deviations above the mean | | B. 0.8 standard deviations below the mean | | C. 7.3 standard deviations below the mean | | D. 207 standard deviations below the mean | |
| Question 34 of 40 | 0.0/ 2.5 Points |
Suggest the cause of the correlation among the data.
The graph shows strength of coffee (y) and number of scoops used to make 10 cups of coffee (x). Identify the probable cause of the correlation. A. The variation in the x variable is a direct cause of the variation in
the y variable. | | B. There is no correlation between the variables. | | C. The correlation is due to a common underlying cause. | | D. The correlation between the variables is coincidental. | |
| Question 35 of 40 | 0.0/ 2.5 Points |
A sample of 64 statistics students at a small college had a mean mathematics ACT score of 28 with a standard deviation of 4. Estimate the mean mathematics ACT score for all statistics students at this college. Give the 95% confidence interval. A. 28.0 to 30.0 | | B. 25.0 to 27.0 | | C. 29.0 to 31.0 | | D. 27.0 to 29.0 | |
| Question 36 of 40 | 0.0/ 2.5 Points |
30% of the fifth grade students in a large school district read below grade level. The distribution of sample proportions of samples of 100 students from this population is normal with a mean of 0.30 and a standard deviation of 0.045. Suppose that you select a sample of 100 fifth grade students from this district and find that the proportion that reads below grade level in the sample is 0.36. What is the probability that a second sample would be selected with a proportion less than 0.36? A. 0.8932 | | B. 0.8920 | | C. 0.9032 | | D. 0.9048 | |
| Question 37 of 40 | 0.0/ 2.5 Points |
Of the 6796 students in one school district, 1537 cannot read up to grade level. Among a sample of 812 of the students from this school district, 211 cannot read up to grade level. Find the sample proportion of students who cannot read up to grade level. A. 0.14 | | B. 0.26 | | C. 211 | | D. 0.23 | |
| Question 38 of 40 | 0.0/ 2.5 Points |
A population proportion is to be estimated. Estimate the minimum sample size needed to achieve a margin of error E = 0.01with a 95% degree of confidence. A. 7,000 | | B. 8,000 | | C. 9,000 | | D. 10,000 | |
| Question 39 of 40 | 0.0/ 2.5 Points |
The scatter plot and best-fit line show the relation between the price per item (y) and the availability of that item (x) in arbitrary units. The correlation coefficient is -0.95. Determine the amount of variation in pricing explained by the variation in availability.
A. 5% | | B. 10% | | C. 95% | | D. 90% | |
| Question 40 of 40 | 0.0/ 2.5 Points |
In a poll of 400 voters in a certain state, 61% said that they opposed a voter ID bill that might hinder some legitimate voters from voting. The margin of error in the poll was reported as 4 percentage points (with a 95% degree of confidence). Which statement is correct? A. The reported margin of error is consistent with the sample size. | | B. There is not enough information to determine whether the margin of error is consistent with the sample size. | | C. The sample size is too small to achieve the stated margin of error. | | D. For the given sample size, the margin of error should be smaller than stated. | |
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