Following are the data on plant weight and quantity of volatile emissions from Exercises 4.53 and 4.91.

a. Obtain the linear correlation coefficient.
b. Interpret the value of r in terms of the linear relationship between the two variables in question.
c. Discuss the graphical interpretation of the value of r and verify that it is consistent with the graph you obtained in the corresponding exercise in Section 4.2.
d. Square r and compare the result with the value of the coefficient of determination you obtained in the corresponding exercise in Section 4.3.

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x 57 85 57 65 52 67 62 80 77 53 68 у| 8.0 22.0 10.5 22.5 12.0 11.5 7.5 13.0 16.5 21.0 12.0