In an attempt to assess the effect of the length of time spent in using social media to the academic performance of the student, a survey was conducted to ten randomly selected students to determine the number of minutes per week using social media and their scores in a department examination in mathematics which consists of a 50-item test. The data are as follows:

Minutes spent using social media per week (X)

30 45 60 120 180 200 240 300 320 400

Score in the department exam (Y)

45 48 42 40 38 43 20 29 35 15

a.) Compute the correlation coefficient r.

b.) Compute for the value of m and b.

c.) Form the regression equation.