To find out whether there is a relationship between the amount of financial leverage a firm uses and the return on the firm's assets, you collect information on the debt/equity ratio and return on assets for the "big three" automakers and the average for the auto industry. Estimate the regression of Fords's return on assets against its debt/equity ratio. Compute the Durbin-Watson statistic. Does autocorrelation exist?

de_ratio	roa
0.76	0.06
0.81	0.05
0.89	0.06
0.95	0.07
1.02	0.07
1.27	0.03
1.21	0.02
1.22	0.06
1.28	0.09
1.28	0.07
1.26	0.05
1.84	-0.06
2.13	-0.05
2.61	-0.03
2.16	0.08
1.79	0.11
1.58	0.08
1.55	0.09
1.43	0.10
5.66	0.04

H0:	?
Ha:	?
test statistic	?
d_l	?
d_u	?
decision	?