MAL DISTRIBUTION
Normal distribution is defined mathematically. In the normal distribution, 50 percent of the cases fall within .6745 SD [standard deviation] on either side of the data mean, 68.26 percent of cases fall within one SD on either side of the data mean, 95 percent of the cases fall within 1.96 SD on either side of the data mean, 99 percent of the cases fall within 2.58 SD on either side of the data mean, and 99.73 percent of the cases fall within three SD on either side of the data mean (Bartz, 2003). Thus, if the mean in a data set is 45 with a standard deviation of 10, 95 percent of the
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