The Paralyzed Veterans of America recently sent letters to a random sample of 100,000 potential donors and received 4781 donations. They've had a contribution rate of 4.84% in past campaigns, but a staff member worries that the rate is now lower that they've redesigned their letter. Is there evidence that the 4.78% they received is evidence of a real drop in the contribution rate? . Assume the independence assumption is met. c) Do you think the donation rate would

drop?

The test statistic is

z=