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A group of researchers developed a 95% z confidence interval for the mean body mass index...

A group of researchers developed a 95% z confidence interval for the mean body mass index (BMI) of women aged 20 to 29 years, based on a national random sample of 633 such women. They assumed that the population standard deviation was known to be σ = 7.5. In fact, the sample data had mean BMI x = 26.9 and standard deviation s = 7.55. What is the 95% t confidence interval for the mean BMI of all young women? (Round your answers to THREE decimal places.)

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Answer #1

Here we can​​​​ use ti-83 calculator.

95% confidence interval for mean BMI of all women is,

26.311 < u < 27.489

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