a geneticist is interested in the proportion of african males who have a certain minor blood disorder. in a random sample of 100 african males, 24 were found to be afflicted. (a) compute a 99% confidence interval for the proportion of african males who have this blood disorder. (b) what sample size (i.e., the number of african males) is needed if we wish to construct the 99% confidence interval of the proportion of african males with this blood disorder to be 0.20?