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Is smoking during pregnancy associated with premature births? To investigate this question, researchers selected a random...

Is smoking during pregnancy associated with premature births? To investigate this question, researchers selected a random sample of 133 pregnant women who were smokers. The average pregnancy length for this sample of smokers was 257 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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