Question: For all sample size calculation, alpha = 0.05 (i.e the confidence level =95%), and the power is 80% (i.e. beta = 0.2). Question 1 part

For all sample size calculation, alpha = 0.05 (i.e the confidence level =95%), and the power is 80% (i.e. beta = 0.2).

Question 1 part A: To construct a 95% CI for a proportion (p) of 20% with margin of error = 2.5%, what is the minimum sample size required?

Question 1 part B: To construct a 95% CI for a mean with standard deviation of 15, margin of error = 3, and attrition =15%, how many patients are required to enroll?

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