K The following gives the class size (x) and the average test score (y). Class 15 17 18 20 21 24 26 29 size Average 85.3 86.2 85.0 82.7 81.9 78.8 75.3 72.1 test score . . . a. Find the P-value: b. Find the correlation coefficient: (Round to four decimal places) c. Write the regression equation in SHOW YOUR WORK. d. In the SHOW YOUR WORK area, answer the question: Do smaller class sizes CAUSE one to do better on tests? (Explain)