The following data gives the number of hours 7 students spent studying and their corresponding grades on their midterm exams. Hours Spent Studying 1 1.5 2 2.5 3.5 4 6
Midt erm Grades 66 75 78 81 87 90 93

Required:
a. Calculate the correlation coefficient, r.
b. Determine if r is statistically significant at the 0.01 level
c. Determine if r is statistically significant at the 0.05 level
d. Calculate the coefficient of determination, r^2.