Refer to the previous exercise. Suppose that 64 smokers (instead of 49) were sampled. Assume the sam


Question: Refer to the previous exercise. Suppose that 64 smokers (instead of 49) were sampled. Assume the sample mean and the sample standard deviation remained the same ($20 and $5, respectively).

a. What is the 95 percent confidence interval estimate of \(\bar{X}\) ?

b. Explain why this confidence interval is narrower than the one determined in the previous exercise.

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