a. Calculate the covariance of the set of data (20, 10), (30, 50), (60, 30), (80, 20),

Question:

a. Calculate the covariance of the set of data (20, 10), (30, 50), (60, 30), (80, 20), (110, 60), and (120, 10).
b. Calculate the standard deviation of the six x values and the standard deviation of the six y values.
c. Calculate r, the coefficient of linear correlation, for the data in part a.
d. Compare these results to those found in the text for Example 13.