a. A random sample of 25 was drawn from a

a. A random sample of 25 was drawn from a population. The sample mean and standard deviation are x? = 510 and s = 125. Estimate µ with 95% confidence.,b. Repeat part (a) with n = 50.,c. Repeat part (a) with n = 100.,d. Describe what happens to the confidence interval estimate when the sample size increases.