Refer to the data and output of Exercise 11.74.
a. Predict the mean fuel usage of all 1,000-mile flights. Give a 95% confidence interval.
b. Predict the fuel usage of a particular 1,000-mile flight. Would a usage of 628 gallons be considered exceptionally low?
REFERENCE:
11.74: An airline studying fuel usage by a certain type of aircraft obtains data on 100 flights. The air mileage x in hundreds of miles and the actual fuel use y in gallons are recorded. Statistix output follows and a plot is shown.
a. Locate the regression equation.
b. What are the sample correlation coefficient and coefficient of determination? Interpret these numbers.
c. Is there any point in testing
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