A statistics practitioner randomly sampled 100 observations from a population whose standard deviation ...

     A   statistics practitioner randomly sampled 100 observations from a population   whose standard deviation is 5 and found that is 10. Estimate the population   mean with 90% confidence.      B. Repeat Part A with 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.