1608 We have the survey data on the body mass index BMI of 6

(16.08) We have the survey data on the body mass index (BMI) of 662 young women. The mean BMI in the sample was xbar=27.9. We treated these data as an SRS from a Normally distributed population with standard deviation =7.8.

Give confidence intervals for the mean BMI and the margins of error for 90%, 95%, and 99% confidence.

Conf. Level                   Interval (±0.01)            margins of error (±0.0001)

90%                            _____ to _____                     _________

95%                            _____ to _____                     _________

99%                            _____ to _____                     _________

Solution