2. Is smoking during pregnancy associated with premature births? To investigate this question, researchers selected a random sample of 114 pregnant women who were smokers. The average pregnancy length for this sample of smokers was 260 days. From a large body of research, it is already known that length of human pregnancy has a standard deviation of 16 days. Based on this study, find a 95% confidence interval for u, the mean pregnancy length of women who smoke during their pregnancy, and interpret your interval estimate in context.

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