a. Use a recent result from the Census Bureau :66% of adults buy clothing online . b. Assume that we have no prior information suggesting a possible value of the proportion 7.3 Exam ples Example: Find 95% CI for IQ scores of professional athletes given that n = 25, X = 104, and s = 12. Assume that the assumptions of t distribution are satisfied. Steps: 1. Construct a 95 % CI. 2. Interpret the interval. 3. Find E. Example: A common claim is that garlic lowers cholesterol levels. In a test of the effectiveness of garlic, 49 subjects were treated with doses of raw garlic, and their cholesterol levels were measured before and after the treatment. The changes in their levels of LDL cholesterol (in mg/dL) have a mean of0.4 and a standard deviation of 21.0 . a. Are the assumption satisfied? b. Construct a 95% confidence interval estimate ofthe mean net change in LDL cholesterol after the garlic treatment. c. what does the confidence interval suggest about the effectiveness of garlic in reducing LDL cholesterol? Example: Health officials are interested in estimating the population mean number of cigarettes smoked annually per capita. A random sample of 8 US counties yielded the following number of cigarettes