Jan 24: Assignment 2 Questions

Just to clarify, was the sample size determined with a targeted significance level 0.05 and power 0.80 using the asymptotic result that a difference in proportions is normally distributed when n is large?

If yes, was the sample size, n, deemed large enough?

The authors were not exactly clear on how they did their sample size calculations. Did they calculate a confidence interval (what they call an "equivalence range" (?) ) for the estimate in the pilot study, and then use the end points of that estimate in their sample size calculation?