STAT
HW 7

# A survey is conducted to study the backgrounds of

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10. A survey is conducted to study the backgrounds of professional golfers. In particular, the question is what percentage of professional golfers had parents who also played golf. A random sample of 300 professional golfers were surveyed. It was found that 225 of them (75%) indicated that their parents played golf. Which of the following is the population of interest? a) All professional golfers. b) All of the parents of professional golfers. c) The 300 professional golfers surveyed. d) The parents of the 300 golfers surveyed. WORK IT OUT PROBLEMS! 11. You want to estimate the average starting salary for recent business majors and you want the margin of error of your results to be no more than \$500. Assume that the standard deviation of starting salaries for all recent business major graduates is \$8000 and that you want to have 95% confidence in your results. What should your sample size be? ANS___________ 2

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#12-13: A toothpaste company sells toothpaste tubes that are labeled 6.0 ounces on the package. You want to see if they are being true to what their label says. You want to estimate the average fill amount for the toothpaste tubes based on your own data. You took a random sample of 200 tubes of toothpaste and your computer output is shown below. Assume the standard deviation of the population of all toothpaste tubes is 0.5 ounces. Descriptive Statistics: Weight (ounces) Variable Count Mean Weight 200 5.6 12. Find a 95% confidence interval for mean weight of all the toothpaste tubes filled by this company based on your data. 13. Based on your confidence interval, is the company filling their toothpaste tubes with the labeled amount (6.0 ounces) on average? Explain (1-2 sentences only.) #14-15: You want to estimate the average price of a house in Columbus, OH. You want the margin of error to be no more than \$1000. Prior data shows the standard deviation
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• Winter '07
• rumseyjohnson

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