An SRS of size 100 is taken from Population A with proportion 0.8 of successes. An independent
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An SRS of size 100 is taken from Population A with proportion 0.8 of successes. An independent SRS of size 400 is taken from Population B with proportion 0.5 of successes. The sampling distribution for the difference (Population A –
Population B) in sample proportions has what mean and standard deviation?
(a) mean = 0.3; standard deviation = 1.3
(b) mean = 0.3; standard deviation = 0.40
(c) mean = 0.3; standard deviation = 0.047
(d) mean = 0.3; standard deviation = 0.0022
(e) mean = 0.3; standard deviation = 0.0002
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