A test is conducted in eight cities to see if givingaway free transit system map

A test is conducted in eight cities to see if givingaway free transit system maps will increase bus ridership. In aregression analysis the dependent variable is the increase in busridership in thousands of persons from the start of the test untilits conclusion. The independent variables are X1 = the number inthousands of free maps distributed and X2 = a binary equal to 1 ifthe city has free downtown parking and 0 otherwise. The estimatedregression equation is Y = 1.32+.0345X1-1.45X2. If the Y value forcity 3 is 7.3 X1 = 140 and X2 = 0 the residual for city 3 inthousands is: