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To test whether or not there is a difference between treatments A, B, and C, a...

To test whether or not there is a difference between treatments A, B, and C, a sample of 12 observations has been randomly assigned to the 3 treatments. You are given the results below.

Treatment

Observation

A

20

30

25

33

B

22

26

20

28

C

40

30

28

22

           The test statistic to test the null hypothesis equals:

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