# AP Statistics

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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 youâ€™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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