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3. Researchers are measuring the strength of association between heart rates of monozygotic twins using Pearson correlation coefficient and data from 30 twins. Answer the following questions: 3a. The test statistic for testing whether the population correlation is 0 has a distribution with degrees of freedom. [0.4 points: 0.2 for each correct answer; GIVE THE CORRECT NUMBER FOR THE DEGREES OF FREEDOM] 3b. The critical value for this test with type I error of 0.05 is [0.4 points]. 3c. When the sample correlation is 0.75, the value of the test statistic is [0.4 points] 3d. Based on the above test statistic, you will not reject the null hypothesis at alpha = 0.05 level. Is this statement TRUE or FALSE? [0.4 points] 3e. For the above sample correlation, the coefficient of determination is [0.4 points]