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surgery durations for all brain tumor patients is 3 13 hours You are a data analyst for a health insurance company and want to test that claim To do so you select a random sample of 32 brain tumor surgery patients and you record the surgery duration for each Assume it is known that the population standard deviation of the durations of all brain tumor surgeries is 1 68 hours Based on your sample follow the steps below to construct a 95 confidence interval for the population mean of the surgery durations for all brain tumor patients Then state whether the confidence interval you construct contradicts the medical group s claim If necessary consult a list of formulas a Click on Take Sample to see the results from your random sample of 32 brain tumor patients Take Sample Sample size Point estimate 0 Population standard deviation 0 Critical value 0 Enter the values of the sample size the point estimate for the population mean the population standard deviation and the critical value you need for your 95 confidence interval Choose the correct critical value from the table of critical values provided When you are done select Compute Compute 0 00 Number of patients 32 0 00 Sample mean 2 00 3 36 Sample standard deviation 1 66 4 00 Standard error Margin of error 95 confidence interval b Based on your sample graph the 95 confidence interval for the population mean of the surgery durations for all brain tumor patients Enter the lower and upper limits on the graph to show your confidence interval For the point enter the medical group s claim of 3 13 hours 95 confidence interval 5 00 6 00 No the confidence interval does not contradict the claim The medical group s claim of 3 13 hours is inside the 95 confidence interval O No the confidence interval does not contradict the claim The medical group s claim of 3 13 hours is outside the 95 confidence interval Population standard deviation 1 68 Yes the confidence interval contradicts the claim The medical group s claim of 3 13 hours is inside the 95 confidence interval 8 00 O Yes the confidence interval contradicts the claim The medical group s claim of 3 13 hours is outside X Critical values 20 005 2 576 0 010 2 326 20 025 1 960 F0 050 1 645 20 100 1 282 X c Does the 95 confidence interval you constructed contradict the medical group s claim Choose the best answer from the choices below 10 00 10 00 5

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