In 400 trials Hairballi hit the sage area on a rotating huma

In 400 trials, Hairballi hit the sage area on a rotating human target 90% of the time.  Suppose that Dr. Maaaavelous would like to obtain a 95% CI for p with marginal error E=0.02. What sample size would be needed? (You may assume that the value 0.9 is an excellent approximation for the true value of p.

Solution

No of Trials n = 400

Proportion of time Hairballi hit the sage area on a rotating human target p = 0.90

Std Error = sqrt[ p * (1