Three different transmission types are installed on different cars, all having 6

Question

Three different transmission types are installed on different cars, all having 6 cylinder engines and an engine size of 3 liters. The fuel consumption (miles per gallon) is found for highway conditions with the results given below in the table. The column titles of A, M, L represent automatic, manual and lockup torque converter, respectively.

A

M

L

23

27

24

23

29

26

20

25

24

21

23

24

At the 0.05 significance level, test the claim that the mean fuel consumption values are the same for all three transmission types. (Note: you can copy and paste the data into your Excel worksheet)

The correct alternative hypothesis for this problem will be:

at least two population means differ

all means are equal

at least two population proportions are different

none of the above

A

M

L

23

27

24

23

29

26

20

25

24

21

23

24

Explanation / Answer

We are perfroming the test to compare three means here. Hence, the correct alternative hypothesis will be:

At least two population means differ.

Option A is correct.

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