A professor is trying to show his students the importance of quizzes even though 90 percent

of the final grade is determined by exams. He believes that the higher the quiz grade, the

higher the final grade. A random sample of 15 students in his class was selected with the data

given below:

Quiz average

59 92 72 90 95 87 89 77 76 65 97 42 94 62 91

Finalaverage

65 84 77 80 77 81 80 84 80 69 83 40 78 65 90

a. State the dependent(Y) and independent(X) variable. Does causation imply

correlation?

b. Draw a scatter diagram

c. Does the relationship between the variables appear to be linear or curvilinear?

d. Does the professor's belief appear to be justified? Explain your reasoning