Consider the following statements on inference procedures for one and two population proportions.Which ONE of the following statements is TRUE?

a. A hypothesis test on p is valid only if the population from which we are sampling is large.

b. When creating a confidence interval, the standard error for p1 -p2 is calculated using the a pooled sample proportion, p.

c.As long as the sample sizes from both populations are greater than 30, we can be certain that our inference procedures for p1 -p2 will be valid.

d.The sampling distribution for p is approximately a binomial distribution, since individuals in the sample either have the characteristic of interest or not.