In a Sample of 10 Randomly Selected Women, It Was $\sigma$

question 70

Essay

In a sample of 10 randomly selected women, it was found that their mean height was 63.4 inches. From
previous studies, it is assumed that the standard deviation, $\sigma$ is 2.4 inches and that the population of height
measurements is normally distributed.
a)Construct the 99% confidence interval for the population mean height of women.
b)If the sample size was doubled to 20 women, what will be the effect on the confidence interval?

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