Consider a random sample of 15 observations of two variables x and y. The data yield the following statistics: x = 3585.33, y = 484.27, _(xi - x)2 = 24838773.33, _(yi - y)2 = 21426.93, r= - 0.7167. Which of the following is correct? Select one: a. The available statistics are not sufficient to determine the correlation between x and y. . b. There is a significant negative correlation between x and y. c. There is a significant positive correlation between x and y. .d. There is no correlation between x and y