27 A study is being planned for estimating the proportion of marned women with living par- ents in the United States who live in the same state as their parents Approximately how large a sample size is needed to guarantee estimating this proportion correct to within

a) .10 with probability 95

b) 05 with probability .95

c) 05 with probability .99

d) .01 with probability 99 Compare sample sizes for parts

(a) and (b),

(b) and (c). and

(c) and (d)