The formula is already given below. Provide clean and clear Solution thank you.

1. A statistics teacher would like to find out whether the possession of a textbook enhances achievement score (X). From an engineering freshmen class of 50 students. she took the scores in a 20 - item quiz of 5 randomly chosen students with textbook (1) and 5 without textbook (0). Compute the correlation between X and Y. Possession of Student Score (Y) Textbook (X) 1 1 17 2 0 9 3 1 13 4 9 0 10 6 8 7 0 15 8 12 9 0 10 10 8 Use the formula for the sample correlation coefficient as Cov(x, y) where: Covlxyl is the covariance of x and y defined as r : s and s, are the Cov(x,y) = E(X- X)(Y - Y) n-1 sample variances of x and y. defined as E(X- X)' and S - E( Y - Y) n -1 n -1