The random sample shown below was selected from a normal distribution.

9,4,4,6,8,5

a. Construct a 95% confidence interval for the population mean u. (Round to two decimal places as needed.)

b. Assume that sample mean x and sample standard deviation s remain exactly the same as those you just calculated but that are based on a sample of n=25

observations. Repeat part a. What is the effect of increasing the sample size on the width of the confidence intervals?