Watch your cholesterol: A sample of 318 patients between the ages of 38 and 82 w

Question

Watch your cholesterol: A sample of 318 patients between the ages of 38 and 82 were given a combination of the drugs ezetimibe and simvastatin. They achieved a mean reduction in total cholesterol of 0.95 millimole per liter. Assume the population standard deviation is = 0.18. Part 1 out of 3 Construct a 99.5% confidence interval for the mean reduction in total cholesterol in patients who take this combination of drugs. Round the answers to two decimal places,if necessary. A 99.5% confidence interval for the mean reduction in cholesterol is

Explanation / Answer

Mean value (x) = 0.95, Standard deviation (s) = 0.18, Number of PATIENTS (N) = 318

Standard error (SE) = s/ n = 0.18/ 318 = 0.10

95% CI = mean ± 1.96 × SE = 0.95 ± 1.96 × 0.10 = 0.754<INTERVA;<1.146

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