Table 4.

F-Test results of comparing models of Table 3.

	F-statics	Degree of Freedom1	Degree of Freedom2	P-value
Model 1 – Model 3	5.35	4	26	0.002
Model 3 – Model 4	10.42	1	25	0.003
Model 4 – Model 5	4.80	1	24	0.038