Question

Automobile	Unleaded	Leaded	Difference (d)	(d-d_bar)^2
1	28,2	27,4	0,8	0,15
2	30,1	29,0	1,1	0,01
3	32,8	29,4	3,4	4,88
4	30,0	28,0	2,0	0,66
5	28,9	31,0	-2,1	10,82
6	31,0	29,6	1,4	0,04
7	32,3	28,3	4,0	7,90
8	30,4	29,6	0,8	0,15
9	27,0	27,0	0,0	1,42
10	28,5	28,0	0,5	0,48
			mean	1,2
			std.dev	1,7
			t-value	2,193
			Critical t-value	-1,833112933
			p-value	0,056006749

A sample of 10 automobiles is selected to determine if there is a significant difference in mileage between unleaded gasoline and leaded gasoline. See the experiment data on the worksheet. A significance level of 0,10 is chosen for the test.

Set up the null and alternative hypothesis and provide the hypothesis test.

Answer 1