题型:填空题 It was_______ that thousands of people saw it. [ ]A. such an exciting film B. a very exciting film C. too excited a film D. so excited an film 查看答案
题型:填空题 有五个不同职业人群的冠心病患病率资料,若比较职业不同患病率是否相同。统计学检验的无效假设应是()。A.H0:p1=p2=p3=p4=p5B.H0:p1=p2=p3=p4>p5C.H0:π1=π2=π3=π4=π5D.H0:π1≠π2≠π3≠π4≠π5E.H0:π1=π2≠π3=π4=π5 查看答案