If we are interested in knowing the proportion of the normal distribution that is associated with two scores that are both located on one side of the mean, then we would
A) add the two proportions together.
B) subtract the smaller proportion from the larger one.
C) subtract the larger proportion from the smaller one.
D) multiply the values of the two proportions together.

Question

Quizplus · Accepted Answer

In a normal distribution, the mean is at the center and 50% of the scores fall on each side of the mean. Therefore, if we are interested in the proportion of the distribution associated with two scores that are both located on one side of the mean, we need to subtract the proportion on the smaller side from the proportion on the larger side. This is because the smaller proportion represents the part of the distribution below or above one score, and the larger proportion represents the part of the distribution below or above the other score. By subtracting the smaller proportion from the larger one, we get the proportion of the distribution that is associated with both scores being on the same side of the mean.

If We Are Interested in Knowing the Proportion of the Normal