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We have the survey data on the body mass index (BMI) of 648 young women. The mean BMI in the sample was x¯=27.2. We treated these data as an SRS from a Normally distributed population with standard deviation σ= 7.4.

Find the margins of error for 90% confidence based on SRSs of N young women.
90%=1.645
N margins of error (± 0.0001)
77
353
1641
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