Mathematics, 25.10.2021 14:00 jetblackcap
Is smoking during pregnancy associated with premature births? To investigate this question, researchers selected a random sample of 118 pregnant women who were smokers. The average pregnancy length for this sample of smokers was 264 days. From a large body of research, it is known that length of human pregnancy has a standard deviation of 16 days. The researchers assume that smoking does not affect the variability in pregnancy length.
Find the 90% confidence interval to estimate the length of pregnancy for women who smoke.
(Note: The critical z-value to use, zc , is: 1.645)
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Is smoking during pregnancy associated with premature births? To investigate this question, research...
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