# O-7 points BowskyintroStatt 8PR.018. My Notes Ask Your Teacher A sample of 20 heads of lettuce...

O-14 points lowskylntroStatt 8.PR 038 7 My Notes Ask Your Teacher + A hospital is trying to cut down on emergency room wait times. It is interested in the amount of time patients must wait before being called back to be examined. An investigation committee randomly surveyed 70 patients. The sample mean was 1.5 hours with a sample standard deviation of 0.5 hours. Identify the following. (Enter exact numbers as integers, fractions, or decimals.) (a) x (b) (c) n (d) n-1 8 1 points llowskylntroStat1 8 PR 040 Ask Your Taachas My Notes A hospital is trying to cut down on emergency room wait times. It is interested in the amount of time patients must wait before being called back to be examined. An investigation committee randomly surveyed 70 patients. The sample mean was 1.5 hours with a sample standard deviation of 0.5 hours. Which distribution should you use for this problem? (Enter your answer in the form z or tar where df is the degrees of freedom.)

18. 13 points lowskylntroStat1 8HW.134. O Ask Your Teacher My Notes In a recent international poll, nine of 41 respondents rated the likelihood of a terrorist attack in their community as "likely" or "very likely. Use the "plus four" method to create a 97% confidence interval for the proportion of American adults who believe that a terrorist attack in their community is likely or very likely. (Round your answers to two decimal places.) Explain what this confidence interval means in the context of the problem We are 97 % confident that the true proportion of American adults that believe that a terrorist attack in their community is likely or very likely lies within this interval. We are 97 % confident that the proportion of American adults in the sample of 41 adults that believe that a terrorist attack in their community is likely or very likely lies within this interval. There is a 97 % chance that an American adult believes that a terrorist attack in their community is likely or very likely We are 97 % confident that an American adult believes that a terrorist attack in their community is likely or very likely

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