Accounts at the firm Walker and Walker believed that several traveling executives submit unusually high travel vouchers when they return from business trips. The accountants took a sample of 200 vouchers submitted from the past year; they then developed the following multiple regression equation relating expected travel cost (Y) number of days, (Y (x1) ) number of days on the road and distance traveled (X2). Y=$90.00 + $48.50x1 + $0.40X2 The coefficient of correlation computed was 0.68.