No deleted files in chapter 1 - Cengage
5. In an effort to estimate the mean amount spent per customer for dinner at a major Atlanta restaurant, data were collected for a sample of 49 customers. Assume a population standard deviation of $5.
a. At 95% confidence, what is the margin of error?
b. If the sample mean is $24.80, what is the 95% confidence interval for the population mean?
6. Nielsen Media Research reported that the household mean television viewing time during the 8 p.m. to 11 p.m. time period is 8.5 hours per week (The World Almanac 2003). Given a sample size of 300 households and a population standard deviation of σ = 3.5 hours, what is the 95% confidence interval estimate of the mean television viewing time per week during the 8 p.m. to 11 p.m. time period?
9. The undergraduate grade point average (GPA) for students admitted to the top graduate business schools was 3.37 (Best Graduate Schools, U.S. News and World Report, 2001). Assume this estimate was based on a sample of 120 students admitted to the top schools. Using past years’ data, the population standard deviation can be assumed known with σ =.28. What is the 95% confidence interval estimate of the mean undergraduate GPA for students admitted to the top graduate business schools?
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