Use the sample data from Exercise 9 to test the claim that the two populations have LDL levels with the same standard deviation. Use a 0.05 significance level.
The baseline characteristics of different treatment groups are often included in journal articles. In one study, 49 subjects treated with raw garlic had LDL cholesterol measurements with a mean of 151 and a standard deviation of 15, while 48 subjects given placebos had LDL cholesterol measurements with a mean of 149 and a standard deviation of 14.