An employer is concerned with the validity of a test. She decided to collect data on a random sample of 15 employees.

An employer is concerned with the validity of a test. She decided to collect data on a random sample of 15 employees. Using the data below assuming that X is the predictor (test) and Y is the criterion (performance).

X: 100 45 60 120 30 45 60 75 90 90 130 90 45 49 50

Y: 88 72 91 95 69 79 78 83 85 78 96 93 90 88 90

a. Compute the correlation

b. Compute the regression line (intercept and slope)

c. Compute the squared correlation

d. Should she continue to use the test for the selection of employees?