研究血铅的分布在蓄电池厂工人和普通纺织厂工人的差异,两组样本量分别为 n 1 =6 和 n 2 =9 ,编秩得到 T 1 =87.5 , T 2 =32.5 ,则 T 为
A.
32.5
B.
55
C.
60
D.
87.5
E.
120
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