Another one i'm stuck with, the examples don't show how to calculate for Za/2 a number just appears in the examples and it's not helpful:
Construct a confidence interval for p 1 minus p 2 p1−p2 at the given level of confidence.
x 1 equals x1=387, n1=518 518, x2=414, n2=598 99% confidence 99% confidence interval for p1 and p2
( − 0 . 0 4 3... View the full answer