### A) Determine the 95% confidence interval estimates of the mean medical costs for each of the four age categories. b) For each year listed, determine the 95% confidence interval estimates of the total medical costs for Canadians 45 years old and older.

12.3-question 1 A statistics practitioner has been given the task of making these predictions. Accordingly, random samples of four groups of Canadians were drawn. They are Group Ages 1 45-64 2 65-74 3 75-84 4 85 and over Age group 2011 2016 2021 2026 2031 45-64 9718 10013