3. A copy machine dealer has data on the number x of copy machines at each...
3. A copy machine dealer has data on the number x of copy machines at each of 97 customer locations and the number y of service calls in a month at each location. Summary calculations give ž 8.4, 5x = 2.3,ỹ = 14.2, sy = 3.8, r = 0.75. a) Find the least squares regression line of number of service calls on number of copiers. b) Interpret the slope in context =