原題:
[婦產(chǎn)科學(xué)]在成組設(shè)計(jì)方差分析的無效假設(shè)是

---

在成組設(shè)計(jì)方差分析的無效假設(shè)是
A.各對(duì)比組樣本均數(shù)相等
B.各對(duì)比組總體均數(shù)相等
C.至少有兩個(gè)對(duì)比組總體均數(shù)相等
D.各對(duì)比組樣本均數(shù)差別無統(tǒng)計(jì)學(xué)意義
E.地對(duì)比組總體均數(shù)不等
答案：
B