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An SRS of size 120 taken from a population having proportion of
successes p1 = 0.40 yields 42 successes. An independent SRS of size
100 taken from a population having proportion of successes p2 =
0.30 yields 22 successes. Reference: Ref 8-8 The sampling
distribution for the difference in the sample proportions, – , has
standard deviation σD equal to: 0.004. 0.064. 0.060. 0.100.
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