9. A sampling method in which one of the first k elements is selected and then every kth element thereafter is selected is known as: A. cluster sampling B. random sampling C. stratified sampling D. systematic sampling E. None of the above 10. In the construction of a confidence interval, as the confidence level required in estimating the mean increases, the width of the confidence interval: A. increases B. decreases C. unchanged 11. A sample of five price/earnings ratios for companies in the Services sector follows: 37 11 14 17 12 Estimate the population mean p/e ratio for the Services sector. A. 10.76 B. 14 C. 18 D. 18.2 E. None of the above answers is correct. 12. A sample of five price/earnings ratios for companies in the Services sector follows: 37 11 14 17 12 Estimate the population standard deviation of the p/e ratios for the Services sector. A. 9.62 B. 10.76 C. 11.5 D. 115.7 E. None of the above answers is correct. 13. A tire manufacturer would like to know what percentage of their company-owned store's customers' tires are underfilled. Over the next few months 100 vehicles are randomly chosen and a tire's pressure is recorded. Of the 100 tires chosen, 60 are underfilled. Estimate the population proportion of underfilled tires. A. 0.06 B. 0.4 C. 0.6 D. 60 tires E. None of the above answers is correct. 14. A population has a mean of 75 and a standard deviation of 10. Samples of size 20 are chosen and the sample means recorded. What is the expected value of the sample mean? A. 2.236 B. 10 C. 75 D. Not enough information is given to answer this question. 15. A population has a mean of 75 and a standard deviation of 10. Samples of size 20 are chosen and the sample means recorded. What is the standard deviation of the sample means? A. 2.236 B. 10 C. 75 D. Not enough information is given to answer this question 16 The admissions office at a college reported that this year's freshman class had an average SAT score of 1103 with a standard deviation of 95. What is the probability that a sample of 40 students from this year's freshman class had an average score greater than 1120? A. 0.1292 B. 0.3708 C. 0.8078 D. 0.8708 E. None of the above 17. The admissions office at a college reported that this year's freshman class had an average SAT score of 1103 with a standard deviation of 95. What is the probability that a sample of 40 students from this year's freshman class had an average score between 1080 and 1120? A. 0.1292 B. 0.3708 C. 0.8078 D. 0.8708 E. None of the above 18. 40% of the employees at a large corporation are female. A sample of 50 employees is taken and gender is recorded. What is the probability of a sample proportion of females in the sample between .35 and .45? A. 0.0693 B. 0.2642 C. 0.5284 D. 0.72 E. None of the above 19. 40% of the employees at a large corporation are female. A sample of 50 employees is taken and gender is recorded. What is the probability of a sample proportion of females in the sample that is within plus or minus 0.05 of the actual population proportion? A. 0.0693 B. 0.2642 C. 0.5284 D. 0.72 E. None of the above 20. A finite population is treated as being infinite if n/N < .05 A. True B. False C. Not enough information is given to answer this questio

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