7.4 Determining the Sample Size
You can find the appropriate sample size to estimate the difference between a pair of parameters with a specified sampling error (SE) and degree of reliability by using the method described in Section 5.5. That is, to estimate the difference between a pair of parameters correct to within SE units with confidence level let standard deviations of the sampling distribution of the estimator equal SE. Then solve for the sample size. To do this, you have to solve the problem for a specific ratio between and Most often, you will want to have equal sample sizes—that is, We will illustrate the procedure with two examples.
Example 7.6 Finding the Sample Sizes for Estimating —Comparing ...
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