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Problem 3


11.8 Using the Model to Create an Estimation Interval

The least squares line for the relationship between the number of pounds overweight and the age at death from problem 56 was y-hat = -0.538X +63.085. Find the 90% confidence interval for an average woman’s age at death given that the woman was 20 pounds overweight (n = 20, x-bar = 8.9, SSxx =2933.8, S = 5.3753).


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