Statistics (2)

Statistics – Probability Density Function and Z Table

It turns out that normally distributed values are quite important in statistics. Not only because the pattern is remarkably common, the central limit theorem enables statisticians to infer conclusions about how a given treatment will affect a given population. To make such inferences, we need to learn about the Probability Density Function and a useful shortcut: the Z Table.

Statistics – Standard Deviation

Most people are familiar with the concepts of the mean, median, and mode. They are measures of the central tendency of a value that has measured in a given population. They tell us, in different ways, about the value of an attribute at the heart of the population, rather than at the positive or negative extremes. Other measures are used to tell us about the variation within a population. One frequently used measure of variation is standard deviation.