1. Suppose that medical researchers want to estimate the true proportion of all teenagers with high blood pressure whose blood pressure would decrease if they took calcium supplements. To test this, they plan a clinical trial in which n = 200 teenagers with high blood pressure will be given calcium supplements.
Suppose the clinical trial is completed, and 120 of the 200 participants experienced a decrease in blood pressure.

Verify that normal approximation methods would be appropriate for this study.