Posted by **Joker** on Thursday, March 14, 2013 at 4:53pm.

12) Which of the following statements is true?

a) The sampling distribution of the difference between two proportions

will always be normal.

b) When comparing two population proportions, either sample proportion

can be used as the unbiased estimate of the true population proportion.

c) If sample sizes are large enough, and if the population is large

compared to the sample, we can compare two proportions using a normal

approximation.

d) When you’re doing inference for two proportions, then number of

degrees of freedom is one less than the smaller of the two sample sizes.

e) None of these are true

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