Find the standard deviation of the distribution in the following situations. (a) MENSA is an organization whose members have IQs in the top 2% of the population. IQs are normally distributed with mean 100, and the minimum IQ score required for admission to MENSA is 132. (b) Cholesterol levels for women aged 20 to 34 follow an approximately normal distribution with mean 185 milligrams per deciliter (mg/dl). Women with cholesterol levels above 220 mg/dl are considered to have high cholesterol and about 18.5% of women fall into this category.

Applied Statistical Methods Chapter 2 Definitions/Notes Associations between Variables: Two variables measured on the same cases are associated if knowing the value of one of the variables tells you something that you would not otherwise know about the value of the other variable Response variable/dependent variable: variable being observed (or measured) Explanatory variable/independent variable: not affected by other variables Scatterplots: visualize the relationship between two quantitative variables What to look for in scatterplots: form of association (linear, curved, etc.), strength of association (amount of scatter), direction of association (positive, negative), special feature