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A.變窄
B.變寬
C.不變
D.不能確定
A.要寬
B.要窄
C.相同
D.可能寬也可能窄
A.正態(tài)分布
B.只有當(dāng)n<30時(shí),為正態(tài)分布
C.只有當(dāng)n≥30時(shí),為正態(tài)分布
D.非正態(tài)分布
最新試題
對(duì)某班級(jí)學(xué)生的生活狀況進(jìn)行統(tǒng)計(jì)調(diào)查,下列標(biāo)志中屬于不變標(biāo)志的是()
某班的學(xué)習(xí)按考試成績(jī)分為60分以下,60-70,70-80,80-90,90-100,這種分組()
Descriptive statistics deals with methods of()
品合格率指標(biāo)是()
One rule that must always be followed in constructing frequency distributions is that ().
One advantage of a stem and leaf plot over a frequency distribution is that ().
Which of the following is best to show the percentage of a total budget that is spent on each category of items?()
以2000年a0為最初水平,2016年an為最末水平,計(jì)算鋼產(chǎn)量的年平均發(fā)展速度時(shí),須開(kāi)()
Which of the following statements is not true?()
什么是季節(jié)變動(dòng)?研究它的意義何在?如何測(cè)定季節(jié)變動(dòng)?