The accompanying data table lists results from car crash tests. Included in results from car crash tests are loads (pounds) on the left femur and right femur, and those values are shown in the table below. What characteristic of the data suggests that the appropriate method of analysis is two-way analysis of variance? That is, what is "two-way" about the data entered in the table?

	Small	Midsize	Large
Left Femur	1184 290 331 708 602 246 332	399 319 299 298 808 281 412	215 1640 737 882 937 878 470	Left Femur
Right Femur	1264 322 446 1046 1480 1045 453	841 714 134 235 685 902 548	754 1202 770 557 667 551 290	Right Femur
	Small	Midsize	Large