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High Cholesterol: A group of eight individuals with high cholesterol levels were given a new drug that was designed to lower cholesterol levels. Cholesterol levels, in milligrams per deciliter, were measured before and after treatment for each individual, with the following results: Individual Before After 1 256 202 2 234 215 3 261 176 4 258 201 5 263 173 6 265 224 7 280 196 8 272 188 @ Send data to Excel Part: 0 / 2 Part 1 of2 (a) Construct a 90% confidence interval for the mean reduction in cholesterol level. Let d represent the cholesterol level before treatment minus the cholesterol level after. Use tables to find the critical value and round the answers to at least one decimal place. A 90% condence interval for the mean reduction in cholesterol level is D