stats quiz 1

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Question 1 of 20
1.0 Points
A sample of 20 observations has a standard deviation of 4. The sum of the squared deviations from the sample mean is:
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    A. 320
  •  
    B. 304
  •  
    C. 288
  •  
    D. 400
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Question 2 of 20
1.0 Points
Suppose that a histogram of a data set is approximately symmetric and "bell shaped". Approximately, what percent of the observations are within three standard deviations of the mean?
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    A. 50%
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    B. 99.7%
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    C. 95%
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    D. 68%
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Question 3 of 20
1.0 Points
Which of the following correctly describes the relationship between a sample and a population? 
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    A. A sample is a group of populations that are subject to observation. 
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    B. A population and a sample are not related. 
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    C. A population is a group of samples that may or may not be included in a study
  •  
    D. A sample is a group of subjects selected from a population to be studied. 
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Question 4 of 20
1.0 Points
A histogram that has a single peak and looks approximately the same to the left and right of the peak is called:
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    A. bimodal
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    B. symmetric
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    C. proportional
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    D. balanced
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Question 5 of 20
1.0 Points
Which of the following statements is true for the following data values: 7, 5, 6, 4, 7, 8, and 12?
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    A. Only the mean and median are equal
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    B. The mean, median and mode are all equal
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    C. Only the median and mode are equal
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    D. Only the mean and mode are equal
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Question 6 of 20
1.0 Points
If a variable has possible values –2, 6, and 17, then this variable is 
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    A. both a continuous and a discrete variable
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    B. a discrete variable
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    C. neither a continuous nor a discrete variable
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    D. a continuous variable
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Question 7 of 20
1.0 Points
Which of the following statements is true regarding the data set 10, 10, 10, 10, and 10?
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    A. The range is zero
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    B. The standard deviation equals zero
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    C. The interquartile range equals zero
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    D. all of the above
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Question 8 of 20
1.0 Points
Gender and State are examples of which type of data?
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    A. Discrete data
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    B. Continuous data
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    C. Categorical data
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    D. Ordinal data
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Question 9 of 20
1.0 Points
If a value represents the 95th percentile, this means that
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    A. 95% of the time you will observe this value
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    B. 95% of all values are below this value
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    C. 95% of all values are above this value 
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    D. there is a 5% chance that this value is incorrect
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Question 10 of 20
1.0 Points
A scatter plot would be useful for
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    A. Showing the trend of sales, over time, of five different brands of blank DVDs 
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    B. Showing the relationship between the sales of blank CDs and blank DVDs 
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    C. Showing the top selling brands of blank DVDs
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    D. Showing the relative number of sales of four different brands of blank DVDs
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Question 11 of 20
1.0 Points
Which of the following indicates how many observations fall into various categories?
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    A. The frequency table
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    B. The tabulation scale
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    C. The Likert scale
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    D. The sample table
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Question 12 of 20
1.0 Points
Which of the following are the three most common measures of central location?
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    A. Mean, median, and standard deviation
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    B. Mean, median, and mode
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    C. Mean, variance, and standard deviation
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    D. Mean, median, and variance
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Part 2 of 3 - 
 
Question 13 of 20
1.0 Points
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A sample of 150 students at a State University was taken after the final business statistics exam to ask them whether they went partying the weekend before the final or spent the weekend studying, and whether they did well or poorly on the final. The following table contains the result.
 
 
Did Well in Exam
Did Poorly in Exam
Studying for Exam
60
15
Went Partying
22
53
 
  

Question 14 of 20
1.0 Points
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The following data are the base salaries, in thousands of dollars, of 50 chief executive officers for a sample of companies doing business with the state of Connecticut. That is, the first entry in the table below corresponds to a salary of $125,000. A copy of this data set can be found in the Excel Workbook called CEOSalaries.xls.
125
157
113
127
201
165
145
119
148
158
148
168
117
105
136
136
125
148
108
178
179
191
225
204
104
205
197
119
209
157
209
205
221
178
247
235
217
222
224
187
265
148
165
228
239
245
152
148
115
150
        Find the median of the CEO salaries, in thousands of dollars, rounded to 2 decimal places. Do not use a dollar sign. Note: $177,760 should be recorded as 177.76.  
 

Question 15 of 20
1.0 Points
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Question 16 of 20
1.0 Points
Click to see additional instructions
The following data are the base salaries, in thousands of dollars, of 50 chief executive officers for a sample of companies doing business with the state of Connecticut. That is, the first entry in the table below corresponds to a salary of $125,000. A copy of this data set can be found in the Excel Workbook called CEOSalaries.xls.
125
157
113
127
201
165
145
119
148
158
148
168
117
105
136
136
125
148
108
178
179
191
225
204
104
205
197
119
209
157
209
205
221
178
247
235
217
222
224
187
265
148
165
228
239
245
152
148
115
150
        Find the interquartile range of the CEO salaries, in thousands of dollars, rounded to 2 decimal places. Do not use a dollar sign. Note: $177,760 should be recorded as 177.76.  
 

Question 17 of 20
1.0 Points
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A sample of 150 students at a State University was taken after the final business statistics exam to ask them whether they went partying the weekend before the final or spent the weekend studying, and whether they did well or poorly on the final. The following table contains the result.
 
 
Did Well in Exam
Did Poorly in Exam
Studying for Exam
60
15
Went Partying
22
53
  

Question 18 of 20
1.0 Points
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A sample of 150 students at a State University was taken after the final business statistics exam to ask them whether they went partying the weekend before the final or spent the weekend studying, and whether they did well or poorly on the final. The following table contains the result.

 Did Well on ExamDid Poorly on Exam
Studying for Exam6015
Went Partying2253

If the sample is a good representation of the population, what percentage of those who did poorly on the final exam should we expect to have spent the weekend studying?  Place your answer in the blank, rounded to 2 decimal places. Do not use a percentage sign (%). For example, 44.44 would be a legitmate answer.  
 

Part 3 of 3 - 
 
Question 19 of 20
1.0 Points
A histogram is skewed to the left (or negatively skewed) if it has a single peak and the values of the distribution extend much further to the right of the peak than to the left of the peak.
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Question 20 of 20
1.0 Points
If you are in a class where most students do reasonably well on a test but a few pull down the class average, the histogram describing the test scores will indicate a positively-skewed distribution.
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