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Win/Loss and With/Without Joe: Joe plays basketball for the Wildcats and missed some of the season...

Win/Loss and With/Without Joe: Joe plays basketball for the Wildcats and missed some of the season due to an injury. The win/loss record with and without Joe is summarized in the contingency table below.

Observed Frequencies: Oi's

Wins Losses Totals
With Joe 15 7 22
Without Joe 6 12 18
Totals 21 19 40


The Test: Test for a significant dependent relationship between wins/losses and whether or not Joe played. Conduct this test at the 0.01 significance level.

(a) What is the test statistic? Round your answer to 3 decimal places.

χ2

=

(b) What is the conclusion regarding the null hypothesis?

reject H0 fail to reject H0    


(c) Choose the appropriate concluding statement.

We have proven that Joe causes the team to do better. The evidence suggests that the outcome of the game is dependent upon whether or not Joe played.      There is not enough evidence to conclude that the outcome of the game is dependent upon whether or not Joe played. We have proven that the outcome of the game is independent of whether or not Joe played.

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