Problem 2: 10 points = [55] Proceed with the same data summaries as before. A sample of n = 25 drivers was selected for a study of their car insurance policy premium. Individual records, (X,: 1 j 25} are assumed to be independent and normally distributed with unknown parameters, (, ). Sample summaries were reported as dollar amounts shown below: X Sample Mean 82.80 and 8 Sample SD = 20 1. Estimate the unknown population mean = with confidence C 0.95 = 95% 2. Show critical value, midpoint, and margin of error. Solution