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An SRS of size 140 taken from a population having proportion of
successes p1 yields 70 successes. An independent SRS of size 120
taken from a population having proportion of successes p2 yields 48
successes. The margin of error in a 95% large sample confidence
interval estimate of the difference in population proportions, p1 –
p2, is: 0.121. 1.96. 0.100. 0.062.
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