This document discusses key concepts in statistics including discrete and continuous variables, independent and dependent variables, and the normal curve. It explains that discrete variables can take on countable values while continuous variables can take on any value. Independent variables are not affected by other variables while dependent variables are affected by independent variables. The normal curve shows that over half the values in a data set fall within one standard deviation of the mean. It also defines an outlier as a data point far from the rest. The document asks questions to assess understanding of these statistical concepts.