6. A researcher is interested in whether increasing the tire pressure of an automobile will lead...

6. A researcher is interested in whether increasing the tire pressure of an automobile will lead to better gas mileage. He collects a sample of automobile owners and measures the MPG. After increasing the tire pressure, he measures the MPG a second time. The data for both measurements is listed below. Was gas mileage significantly higher after increasing the pressures? [note: you will need to calculate the sum of difference scores in order to find the mean of the differences] (5 points total, show all steps)

Car	X1 (original pressure)	X2 (final pressure)
A	14	15
B	21	23
C	30	33
D	17	19
E	19	21
F	25	27
n=6	M1 = 21,	M2 = 23,

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Obs.	X1	X2	d=X1-X2	d2
1	14	15	-1	1
2	21	23	-2	4
3	30	33	-3	9
4	17	19	-2	4
5	19	21	-2	4
6	25	27	-2	4
SUM =			-12	26

orchestra answered 1 year ago

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