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APPLYING THE CONCEPTS:36. Credit-Card Debt A school administrator is concerned about the amount of credit-card debt that college students have. She wishes to conduct a poll to estimate the percentage of full-time college students who have credit-card debt of $2000 or more. What size sample should be obtained if she wishes the estimate to be within 2.5 percentage points with 94% confidence if (a) a pilot study indicates that the percentage is 34%? (b) no prior estimates are used?24. You Explain It! Sleeping A 90% confidence interval for the number of hours that full-time college students sleep during a weekday is lower bound: 7.8 hours and upper bound: 8.8 hours. Which of the following represents a reasonable interpretation of the result? For those that are not reasonable, explain the flaw. (a) 90% of full-time college students sleep between 7.8 hours and 8.8 hours. (b) We are 90% confident that the mean number of hours of sleep that full-time college students get any day of the week is between 7.8 hours and 8.8 hours. (c) There is a 90% probability that the mean hours of sleep that full-time college students get during a weekday is between 7.8 hours and 8.8 hours. (d) We are 90% confident that the mean hours of sleep that full-time college students get during a weekday is between 7.8 hours and 8.8 hours.
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  1. Tutorial # 00152298 Posted By: Dr tonyx Posted on: 12/23/2015 03:41 AM
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    mean hours of sleep that ...
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