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In a previous example about the body mass index of young women we developed a 95% confidence interval for the mean body mass index (BMI) of women aged 20 to 29 yrs, based on a national random sample of 654 such women. We assumed there that the population standard deviation was known to be 7.5. In fact, the sample data had mean BMI x(bar)=26.8 and standard deviation s=7.42. What is the 95% confidence interval for the mean BMI of all young women?

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