According to Statista, in 2016, global retail sales of chocolate amounted to approximately $98.2 billion, making choclates one of the most popular snacks in the world. A random sample of 15 consumers were given varying quantities of chocolates for four weeks. The following (x, y) data shows the number of chocolate cups, X, and the number of days required for recovering, Y, for each consumer:

13, 232 11, 112 110, 242 18, 332 14, 422 18, 352 18, 272 15, 422 19, 382 17, 292 11, 142 12, 222 111, 262 12, 312 13, 362

a. Compute the covariance.

b. Compute the correlation coefficient.