Age : 19 25 18 21 20 23 26 19 25 28 25 22 20 21 19 29 21 22 33 24 26 27 20 19 19 20 27 26 24 23 22 21 20 19 27 20 23 23 18 25 19 27 24 20 21 19 23 18

Exam: 96 97 88 85 82 88 80 75 67 85 89 93 78 74 67 73 92 97 78 79 94 88 92 84 72 83 76 95 88 84 97 86 75 79 78 96 92 87 86 81 72 80 76 79 97 83 83 93

a. The correlation between "age" and "exam." Is it significant? ( = .05)

b. The regression equation with "age" as the independent (explanatory) variable and "exam" as the dependent (response) variable.

c. Does age have a statistically significant effect on exam? ( = .05) Explain why or why not.

d. Find a 95% confidence interval for the coefficient of age in the regression equation.

e. What are the predicted exam score and the residual for an age of 25?