The costs(in thousands of dollars) for tuition, room, and board per year at 15 randomly selected public colleges and 10 randomly selected private colleges are shown in Table 11.3.

			COLLEGES
PUBLIC			PRIVATE
9.1	4.2	11.6		13	17.7
7.7	6.1	10.4		18.8	17.6
6.5	4.9	5		13.2	19.8
6.2	8.5	10.4		14.4	16.8
10.2	4.6	8.1		17.7	16.1

The tabular value at 5% level of significance.