Researchers in Example 27.9 feel that at most 200 patients can be enrolled in the study for each type of surgery. Redo the sample size calculations for that example and identify at least one combination of power and effect size (absolute difference in tear rates) for which the required sample size is 200 or less per surgery type.
For the remaining problems, it is recommended that a software package such as PASS 11 or SAS be employed.