High Cholesterol: A group of eight individuals with high cholesterol levels were given a new drug that was designed to lower O cholesterol levels. Cholesterol levels, in milligrams per deciliter, were measured before and after treatment for each individual, with the following results: Individual Before After EO 238 220 240 210 230 183 245 207 241 170 281 223 241 179 285 185 Send data to Excel Part: 0 / 2 Part 1 of 2 (a) Construct a 99.9% confidence Interval for the mean reduction in cholesterol level. Let d represent the cholesterol level decimal place. before treatment minus the cholesterol level after. Use tables to find the critical value and round the answers to at least one A 99.9% confidence interval for the mean reduction in cholesterol level is