Refer to the previous exercise. For the 397 males in the sample, the mean was 2.89 and

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Refer to the previous exercise. For the 397 males in the sample, the mean was 2.89 and the standard deviation was 1.77.

(a) Show that the standard error of the sample mean is 0.089.

(b) Show that the 95% confidence interval for the population mean is (2.7, 3.1), and explain what “95% confidence”

means.

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