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:

a) Draw a scatter diagram of these data.

b) Does the relationship between the variables appear to be linear or not?

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