Question

O-7 points BowskyintroStatt 8PR.018. My Notes Ask Your Teacher A sample of 20 heads of lettuce was selected. Assume that the population distribution of head weight is normal. The weight of each head of lettuce was then recorded. The mean weight was 2.2 pounds with a standard deviation of 0.1 pounds. The population standard deviation is known to be 0.2 pounds. Construct a 95 % confidence interval for the population mean welght of the heads of lettuce. State the confidence interval. (Round your answers to two decimal places.) Sketch the graph. (Round your answers to two decimal places.) . CL Calculate the error bound, (Round your answer to two decimal places.) 1 points IlowskyintroStatt B.PR 020 My Notes O Ask Your Teachen A sample of 20 heads of lettuce was selected. Assume that the population distribution of head weight is normal. The weight of each head of lettuce was then recorded. The mean weight was 2.2 pounds with a standard deviation of 0.1 pounds. The population standard deviation is known to be 0.2 pounds In complete sentences, give an interpretation of what the 95 % confidence interval for the population mean weight of the heads of lettuce means. We are 95% confident that the weight of a head of lettuce lies within this interval O There is a 95 % chance that the weight of a head of lettuce lies within this interval. We are 95 % confident that the mean weight of the sample of 20 heads of lettuce lies within this interval We are 95 % confident that the true population mean weight of all weights of heads of lettuce lies within this interval. O Ask Your Teache O1 points IlowskylntroStat1 8.PR.022 My Note A sample of 20 heads of lettuce was selected. Assume that the population distribution of head weight is normal. The weight of each head of lettuce was then recorded. The mean weight was 2.2 pounds with a standard deviation of 0.1 pounds. The population standard deviation is known to be 0.2 pounds. What would happen if 40 heads of lettuce were sampled instead of 20, and the confidence level remained the same? O The confidence interval would become wider. There would be no change. The confidence interval would become narrower. 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

Answer 1

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