Question

To estimate the systolic blood pressure for adults, a random sample of 500 adults is selected and yielded a sample mean of 127 and a sample standard deviation of 15. (20 points)
1) Construct a 95% confidence interval for the true mean of the systolic blood pressure. And Interpret the answer.
2) If you increase the sample size to 800 and everything else is the same, the 95% confidence interval will be narrower or wider than the one in part a?

Answer 1

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