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(16.09) We have the survey data on the body mass index (BMI) of 640 young women....

(16.09) We have the survey data on the body mass index (BMI) of 640 young women. The mean BMI in the sample was x¯¯¯=26.6x¯=26.6. We treated these data as an SRS from a Normally distributed population with standard deviation σ=σ=7.8 .

Find the margins of error for 99 % confidence based on SRSs of N young women.

N margins of error (±±0.0001)
139
406
1558
10.

(16.10) An SRS of 400 high school seniors gained an average of x¯¯¯x¯ = 20 points in their second attempt at the SAT Mathematics exam. Assume that the change in score has a Normal distribution with standard deviation 54.

Find a 95% confidence interval for μμ based on this sample.

Confidence interval (±±0.01) is between____ and___

What is the margin of error (±±0.01) for 95%? _____

Suppose we had an SRS of just 100 high school seniors. What would be the margin of error (±±0.01) for 95% confidence? ____
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