(来学网)某职业病防治所对某厂石棉矿工进行了用力肺活量测定,测定的总人数为31人,其中11人已确诊为石棉肺患者,9人是可疑患者,另外11人是非患者。比较3组的平均用力肺活量发现:三个样本均数各不相同α=0.05,应与求得的统计量F值做比较的临界值是()
  • A.
    (来学网)F(2,3.),0.05
  • B.
    (来学网)F(2,28.),0.05
  • C.
    (来学网)F(2,31.),0.05
  • D.
    (来学网)F(2,28.),0.025
  • E.
    (来学网)F(2,28.),0.10
正确答案:
B