EP FUNDAMENTALS OF STAT.-MYLAB STAT.ACC
EP FUNDAMENTALS OF STAT.-MYLAB STAT.ACC
5th Edition
ISBN: 9780135960004
Author: Sullivan
Publisher: PEARSON CO
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Chapter B.3, Problem 12AYU
To determine

To find: The sufficient evidence to indicate that the standard deviation is not 0.5 gram per serving.

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The average miles per gallon for a sample of 40 cars of model SX last year was 32.1, with a population standard deviation of 3.8. A sample of 40 cars from this year’s model SX has an average of 35.2 mpg, with a population standard deviation of 5.4. Find a 99 percent confidence interval for the difference in average mpg for this car brand (this year’s model minus last year’s).Find a 99 percent confidence interval for the difference in average mpg for last year’s model minus this year’s. What does the negative difference mean?
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