Question

1	19.7
1	14.7
1	19.5
1	18
1	15.3
1	13
1	18.1
1	22.6
1	17.2
1	22
2	11.8
2	11.5
2	13.8
2	4
2	12.1
2	13.4
2	16.6
3	15.3
3	17.2
3	22.4
3	21.2
3	22.1
3	22.7
3	24.5
3	19.5
3	21.5
4	14.7
4	14
4	13.7
4	14.6
4	14.4
4	17.2
4	17.2
4	17.4
4	14.6

1. What is the value of the F-statistic for testing the null hypothesis that there are no differences in gasoline mileage among the four makes of automobile?

2. What are the degrees of freedom associated with the denominator of the F-value for MAKE of car?

3. What is the estimate of the pooled variance within makes of cars (ie. the error mean square)?

Answer 1