I need someone that is really good in business statistics. 4 test at 10.00 each

Student ID: 22357317

Exam: 250711RR - Data: Description, Collection, and Sampling

When you have completed your exam and reviewed your answers, click Submit Exam. Answers will not be recorded until you hit Submit Exam. If you need to exit before completing the exam, click Cancel Exam.

Questions 1 to 20: Select the best answer to each question. Note that a question and its answers may be split across a page break, so be sure that you have seen the entire question and all the answers before choosing an answer.

1. When a sample is taken from a larger population, this suggests that which of the following will be used? A. Computation of a sample mean

B. Inferential statistics

C. Descriptive statistics

D. Independent events

2. To answer the question, refer to the following list of raw data.

63, 71, 72, 77, 77, 78, 86, 77, 88, 88

What is the median for the data? A. 77.5

B. 77

C. 77.7

D. 88

3. Which of the following statements is true? A. A population is the object upon which we collect data.

B. When taking a sample from the population, the variable involved will always be qualitative.

C. In a true census, no inferential statistics can be done, because the entire population is the sample.

D. The definition of a census is the decennial census of the United States of America.

4. A particular sample contains 50 data values. According to Chebyshev's theorem, which of the following is the number of values you would expect to fall within 3.0 standard deviations of the mean? A. 5

B. 35

C. 25

D. 45

5. Use the following data sample to answer the question.

4, 14, 6, 9, 21, 3, 7, 10

What is the range of this data sample?

A. 4

B. 6

C. 10

D. 18

6. Which type of plot takes quantitative data and forms classes out of it, thus turning it into qualitative data? A. Pie chart

B. Dot plot

C. Stem-and-leaf plot

D. Histogram

7. When obtaining data by _______ it's most important to inquire about the purposes of the original experimenter. A. performing a designed experiment

B. conducting a survey

C. collecting data observationally

D. reading a published source

8. To answer the question, refer to the following list of raw data.

63, 71, 72, 77, 77, 78, 86, 77, 88, 88

What is the mode for the data? A. 88

B. 77.7

C. 77

D. 77.5

9. To answer the question, refer to the following list of raw data.

63, 71, 72, 77, 77, 78, 86, 77, 88, 88

What is the mean for the data? A. 88

B. 77.7

C. 77.5

D. 77

10. Which of the following statements about interpreting standard deviation is true? A. The Empirical Rule can't be applied unless the frequency distribution is mound-shaped and symmetric. Chebyshev's Rule can be applied to any data set, regardless of the shape of its frequency distribution.

B. Chebyshev's Rule can't be applied unless the frequency distribution is mound-shaped and symmetric. The Empirical Rule can be applied to any data set, regardless of the shape of its frequency distribution.

C. Neither Chebyshev's Rule nor the Emprical Rule require any assumptions about the frequency distribution.

D. Neither the Empirical Rule nor Chebyshev's Rule can be applied to data unless the frequency distribution is mound-shaped and symmetrical.

11. Use the following data sample to answer the question.

4, 14, 6, 9, 21, 3, 7, 10

What is the mean of this data sample? A. There's no mean value.

B. 7

C. 8

D. 9.25

12. To answer the question, refer to the following data.

Ten students were sampled at random from a student population. Each was asked how many courses he or she was planning on studying in the upcoming year. The following is a list of the reported data values: 1, 2, 2, 3, 4, 5, 5, 5, 5, 6

What is the variance for the data values? A. 2.56

B. 1.6

C. 1.687

D. 2.844

13. Use the following data sample to answer the question.

4, 14, 6, 9, 21, 3, 7, 10

What is the variance of this data sample? A. 5.90

B. 34.79

C. 243.5

D. 4.31

14. To answer the question, refer to the following data.

Ten students were sampled at random from a student population. Each was asked how many courses he or she was planning on studying in the upcoming year. The following is a list of the reported data values: 1, 2, 2, 3, 4, 5, 5, 5, 5, 6

What is the standard deviation for the data values? A. 1.44

B. 2.84

C. 2.56

D. 1.687

15. Which of the following involves inferential statistics as opposed to descriptive statistics? A. A class of 50 statistics students earned an average grade of 73.5.

B. The Alcohol, Tobacco and Firearms department reported that Houston had 1,791 registered gun dealers in 1997.

C. A local cable system, using a sample of 500 subscribers, estimates that 40 percent of its subscribers watch a premium channel at least once per day.

D. The city business office reported 35 building permits for new single-family housing units.

16. If a great many data values cluster to the left of a data distribution, which then tails off to the right, the distribution is referred to as A. leftward skewed.

B. uniform.

C. rightward skewed.

D. normal.

17. Use the following data sample to answer the question.

4, 14, 6, 9, 21, 3, 7, 10

What is the standard deviation of this data sample? A. 4.31

B. 5.90

C. 243.5

D. 34.79

18. Several ways to make a bar graph deceptive appear below. Which of these is sometimes used to exaggerate differences from one data value to the next? A. Making the graph shorter than it needs to be

B. A gap in the vertical axis

C. Making the graph taller than it needs to be

D. Starting the vertical axis at a point greater than zero

19. In a sample with mean x = 12 and standard deviation s = 3.5, a data point at 16.8 would have what sample z-score? A. We can't know the answer without knowing the population mean μ and standard deviation σ. B. 1.37

C. 1.4

D. 4.8

20. Consider the following distribution:

End of exam

Which of the following would you expect? A. The mean is greater than the median, and the median is greater than the mode.

B. There's no difference in the values of the mean, median, and mode.

C. The mean is less than the median, and the median is less than the mode.

D. The mean is greater than the mode, which in turn is greater than the median.