If n=560 and ˆ p (p-hat) =0.49, find the margin of error at a 95% confidence level

Question

If n=560 and  (p-hat) =0.49, find the margin of error at a 95% confidence level

Answer 1

ME = z-critical * sqrt((phat * (1-phat)/n)

find z-critical for (0.95 + 1.0)/2 = 0.975 probability from table or using technology = 1.96.

phat given as 0.49 and n given as 560. Plug in values to get ME.