The range of the set of values $2.35, $4.16, $3.42, $1.29, $.89, $4.55.

Question

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?

Answer 1

Question

Chapter 21.II, Problem 16RE

To determine

To calculate: The range of the set of values $2.35, $4.16, $3.42, $1.29, $.89, $4.55.

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