an instructor wanted to know the relationship between his review sessions and passing the final exam he r/

(a) Compute the phi correlation coefficient.
(b) Using a two-tailed test at a .05 level of significance, state the decision to retain or reject the null hypothesis. Hint: You must first convert r to a χ2 statistic.
(c) Explain why the simplified formula ((matches − mismatches)/sample size) can be used to compute the phi correlation coefficient using these data.