a. A statistics practitioner randomly sampled 100 observations from a

a. A statistics practitioner randomly sampled 100 observations from a population with a standard deviation of 5 and found that x? is 10. Estimate the population mean with 90% confidence.,b. Repeat part (a) with a sample size of 25.,c. Repeat part (a) with a sample size of 10.,d. Describe what happens to the confidence interval estimate when the sample size decreases.