Determining the % of cases which fall between any two scores
- For our IQ data - suppose we want to know what % of scores fall between 123.49 and 113.32.
- First we convert these scores to z scores
(123.49-103.29)/20.2 = 1.00 (113.32-103.29)/20.2= .50
- Then we get the area from column 2 and subtract
.3413-.1915=.1498 or 15%
- To see exactly where the above values came from, use the table in your book and work through this problem.