Please Quickly solve... DATA dwaine; INPUT persons income sales; DATALINES; 68.5 16.7 174.4 45.2 16.8 164.4 91.3 18.2 244.2 47.8 16.3 154.6 46.9 17.3 181.6 66.1 18.2 207.5 49.5 15.9 152.8 52.0 17.2 163.2 48.9 16.6 145.4 38.4 16.0 137.2 87.9 18.3 241.9 72.8 17.1 191.1 88.4 17.4 232.0 42.9 15.8 145.3 52.5 17.8 161.1 85.7 18.4 209.7 41.3 16.5 146.4 51.7 16.3 144.0 89.6 18.1 232.6 82.7 19.1 224.1 52.3 16.0 166.5 ; PROC REG DATA=dwaine; MODEL sales = persons income; RUN; PROC REG DATA=dwaine; MODEL sales = income; RUN; 

Compare the slope for income between the two tables. Can you give an explanation for the difference?

(c) Which value of slope do you think represents the effect of income on sales more accurately?