Normal Distribution. The Bell Curve. Questions. What are the parameters that drive the normal distribution? What does each control? Draw a picture to illustrate. Identify proportions of the normal, e.g., what percent falls above the mean? Between 1 and 2 SDs above the mean?
The Bell Curve
(Negative exponent means that big |z| values give small function values in the tails.)
About 54 % of scores fall below z of .1. About 46 % of scores fall below a z of -.1 (1-.54 = .46). About 14% of scores fall between z of 1 and 2 (.98-.84).