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Confidence Intervals and Hypothesis Testing Introduction to constructing a confidence interval for a population mean.. 0/5 Kersten V V "pulation mean, you select a random sample of 10 fully grown male killer whales living in captivity and record the lengths (in m) of each male killer whale. ..-sume that the population is approximately normally distributed. Espanol Based on your sample, follow the steps below to construct a 90% confidence interval for the population mean of all lengths of fully grown male killer whales living in captivity. (If necessary, consult a .) (a) Click on "Take Sample" to see the results for your random sample. ? Number of killer whales Sample mean Sample standard deviation Take Sample 10 6.882 1.441 Enter the values of the sample size, the point estimate of the mean, the sample standard deviation, and the critical value you need for your 90% confidence interval. (Choose the correct critical value from the table of critical values provided.) When you are done, select "Compute". Sample size: 5 X Standard error: Point estimate: Sample standard deviation: Margin of error: Confidence level Critical value 99% Critical value: 0.005 = 3.250 Explanation Check 2025 McGraw Hill. Terms of Use. | Privacy Center | Accessibility 0.050 (b) Based on your sample, enter the lower and upper limits to graph the 90% confidence interval for the population mean of all the lengths of fully grown male killer whales living in captivity. 0.000 10.000 0.000 2.000 4.000 6.000 8.000 10.000 X