The following table shows the values of a certain clothing expenditure (Y), total expenditure (X1) and clothing price (X2) on an arbitrary unit basis, as well as the equation for the regression of the smallest times estimated from them

a) interpret the autocorelation parameter for the Model.
b) investigate the presence of autocorelation in the model with the Durbin –Watson Test at 0.05 error level.
c) interpret the change in clothing expenses.
 

Y X X 3.5 15 16 4.3 20 13 30 10 42 7 7 50 8 9 54 5 8 65 4 10 72 3 12 85 3.5 14 90 2