Measures of central tendency provide information on where the majority of data lie. However, these measures do not inform the reader regarding the distribution of data across possible values or their variability from one subject to the
next. One method for describing a collection of values is called distribution. A normal distribution is typically described as
being bell shaped, with a middle that is exactly in the center of the distribution. In addition, the tails (sides) of the distribution
are symmetric, having the exact same shape (Figure 2). The presence of a normal distribution of data in the population
is a common assumption for inferential statistics.