The random sample shown below was selected from a normal distribution. 4, 6, 7, 10, 5, 4 Complete parts a and b. a. Construct a 99% confidence interval for the population mean p. (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