consider the following data:

UBI POH TLAM

120, 9, 21

60, 5, 16

18, 3, 12

21, 5, 12

85, 7, 17

60, 7, 16

(If you want to check data entry: sample covariance UBI, POH = 61.67; UBI, TLAM = 108.39)

a. What is the least squares linear regression equation when UBI is the dependent variable (Y) are X

variables two?

b. Which of the coefficients, if any, are significantly different from zero at the 90% level?