final-a-s97

# final-a-s97 - MSCI 3700 FINAL EXAM - A Spring, 1997 Name _...

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MSCI 3700 FINAL EXAM - A Name _________________________ Spring, 1997 Questions 1 - 8 are true/false questions. Indicate 'A' for true answers and 'B' for false answers on the Scantron. 1. A sample variance is always non-negative. 2. If two groups of data have the same mean, then the standard deviation and the coefficient of variation are equally useful measures for comparing the variability of the two groups. 3. A survey of homes in a particular neighborhood revealed home selling prices ranging from \$120,000 to \$280,000. A reasonable estimate of the standard deviation of selling prices is \$40,000. 4. The only way for a sample standard deviation to be zero is for all the sample values to be the same. 5. The major advantage of random sampling is that X- = for μ every sample. 6. If n = 5, then the sample mean will be normally distributed if the population is normally distributed. 7. In a confidence interval for the population mean, the width of the interval (upper limit minus lower limit) decreases as the sample size increases. 8. If the null hypothesis is rejected in a test, this proves that the null hypothesis is false. 9. A sample of 500 respondents was selected in the D/FW metropolitan area in order to determine various information concerning consumer behavior. Among the questions asked was, “Do you enjoy shopping for clothing?” Of the 240 males in the sample, 136 answered yes. Of the 260 females in the sample , 224 answered yes. Find the probability of a male who does not enjoy shopping for clothing. a. .224 b. .360 c. .208 d. .480 e. .140

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Questions 10 - 14 use the following information. The following data represent the fringe benefits as a percentage of salaries paid at the 16 reporting institutions of higher learning in the state of Texas during the 1996-1997 academic year. 11, 17, 18, 10, 22, 23, 15, 17, 14, 13, 10, 12, 18, 18, 11, 14 10. What is the sample mode? a. 17 b. 18 c. 11 d. 14 e. 10 11. What is the sample median? a. 14 b. 15 c. 17 d. 14.5 e. 15.5 12. What is the sample standard deviation? a. 4.037

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## This note was uploaded on 03/09/2011 for the course DSCI 2710 taught by Professor Hossain during the Spring '08 term at North Texas.

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final-a-s97 - MSCI 3700 FINAL EXAM - A Spring, 1997 Name _...

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