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 311 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