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In: Statistics and Probability

A psychologist studying addiction tests whether cravings for cocaine and relapse are independent. The following table...

A psychologist studying addiction tests whether cravings for cocaine and relapse are independent. The following table lists the observed frequencies in the small sample of people who use drugs.

Obs. Freq. Relapse   
Yes No
Cravings Yes 21 10 31
No 7 18 25
   28 28 N = 56

(a) Conduct a chi-square test for independence at a 0.05 level of significance. (Round your answer to two decimal places.)
=  

Decide whether to retain or reject the null hypothesis.

Retain the null hypothesis.Reject the null hypothesis.   


(b) Compute effect size using ϕ and Cramer's V. Hint: Both should give the same estimate of effect size. (If necessary, round your intermediate steps to two or more decimal places. Round your answers to two decimal places.)

ϕ =
V =

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orchestra answered 1 year ago
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