Consider the following set of data.

a. Compute the value of the test statistic z_ that would be used to test the null hypothesis that p1 = p2 where p1 and p2 are the proportions of €œyes€ responses in the respective groups.
b. Compute the value of the test statistic x2 that would be used to test the hypothesis that €œResponse is independent of group.€

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Response Yes 75 70 145 No 25 30 Total 100 100 200 Group I Group 2 Total