在某药物代谢动力学研究中对10名研究对象进行了血浆浓度(X)和每克蛋白的药物吸附量(Y)的测定，结果如下\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n

ID	1	2	3	4	5	6	7	8	9	10
x	12.7	21.2	51.7	77.2	212.4	9.5	22.5	42.3	67.8	234.8
y	0.10	0.466	0.767	1.573	2.462	0.08	0.399	0.899	1.735	2.360

欲比较两者的变异度大小，应选用下面哪项指标