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【单选题】
对10名25岁以上的山区健康男子测量脉博次数(次/分),用t检验与全国正常男子治疗进行比较,按a=0.05的检验水准,自由度为A.
v=9
B.
p=19
C.
u=8
D.
p=20
E.
v=I8
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