In each of the following cases, determine whether the sample size n is large enough to use the large sample formula presented in the box on page 329 to compute a confidence interval for p.

a. p̂ = .1, n = 30

b. p̂ = .1, n = 100

c. p̂ = .5, n = 50

d. p̂ = .8, n = 400

e. p̂ = .9, n = 30

f. p̂ = .99, n = 200