Psychological Associates, a consulting firm, has revised a test that is used to select managers for a large chain of hamburger restaurants Option. The researcher believed that the revised test is better than the current test Option. The revised test was given to a random sample of 170 managers Option. The correlation between their test scores and a measure of their stores net incomes was Option. 31 Option. The correlation for the old test was Option. 19 Option.

a Option. Compute a one-sided 100(1 Option. 05) % = 95% confidence interval for r Option. Locate the confidence interval on the real number line Option.

b Option. Specify all the null hypotheses that could be rejected Option.

c Option. Should the revised test be used in selecting future managers for the chain?  Why?  

d Option. Interpret the effect size Option.