FIGURE 6-11
Creating a Distribution of Means
Compare this distribution of means to the distribution of scores in Figure 6-10. The mean is the same and it is still roughly bell-shaped. The spread is narrower, however, so there is a smaller standard deviation. This particular distribution is one of many similar distributions that could be created by pulling 30 means (the average of three numbers at a time) from the population of 140 heights.