Question

Gasoline mileage (mpg) was measured on several cars of each of four different makes (coded 1, 2, 3 and 4). The make of each car is stored in the first column, and the mileage for each car is stored in the second column, of Table A. You need to conduct an analysis of variance to see if there are differences among the four makes in gasoline mileage. You should also estimate the mileage of each of the four makes of cars.

NOTE: For the following questions (6 - 13), use the error mean square and the error degrees of freedom to calculate confidence intervals and to test hypotheses about pairs of means

6. How many cars of make 2 were evaluated in this experiment?

7. What was the average gasoline mileage for make 2?
8. How many cars of make 3 were evaluated in this experiment?

9. What was the average gasoline mileage for make 3?

10. What was the margin of error for the confidence interval for gasoline mileage of make 2?

11. What was the lower 95% confidence limit for make 2 mileage?

12. What was the upper 95% confidence limit for make 2 mileage?

13. What is the value of the t test statistic for testing the hypothesis that makes 2 and 3 do not differ in mileage?

1	20
1	16.8
1	24.1
1	12.7
1	10.2
1	18.7
1	18.8
1	14.7
2	9.2
2	7.1
2	14.3
2	13.5
2	12.2
2	10.3
2	9.2
3	15.5
3	22.8
3	18.5
3	24
3	25.3
3	23
3	15.9
3	23
3	21.2
4	7
4	13.3
4	11.4
4	15.7
4	20.8
4	14.1
4	19.2
4	16.1

Answer 1

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