The Mean

The mean, also called the average, provides information about the center of the distribution. If we measured the heights of 10-year-old and 18-year-old boys and plotted a frequency distribution for each group, we would find that both distributions are normal, but the two distributions would be centered at different heights, and this difference would be indicated in their different means (I Figure 22.8).

If we represent a group of measurements as xv x2, x3, and so forth, then the mean (x) is calculated by adding all the individual measurements and dividing by the total number of measurements in the sample (n):

A shorthand way to represent this formula is _ 2xi or

0 0

Post a comment