多項(xiàng)選擇題要了解某地區(qū)全部大學(xué)生的就業(yè)情況,那么()

A.全部大學(xué)畢業(yè)生是研究總體
B.大學(xué)畢業(yè)生總數(shù)是統(tǒng)計指標(biāo)
C.大學(xué)畢業(yè)生就業(yè)率是統(tǒng)計標(biāo)志
D.反映每位大學(xué)畢業(yè)生特征的職業(yè)是數(shù)量指標(biāo)


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1.單項(xiàng)選擇題最能反映離散程度的指標(biāo)是()

A.全距
B.標(biāo)準(zhǔn)差
C.平均差
D.標(biāo)準(zhǔn)差系數(shù)

3.單項(xiàng)選擇題在組距數(shù)列中,下限就是()

A.每個組的最小值
B.每個組的最大值
C.全距中的最大值
D.全距中的最小值

4.單項(xiàng)選擇題某企業(yè)的生產(chǎn)計劃完成百分比采用如下分組,請指出哪項(xiàng)是正確的()

A.80%~89%,90%~99%,100%~109%,110%以上
B.80%以下,80.1%~90%,90.1%~100%,100.1%~110%
C.90%以下,90%~100%,100%~110%,110%以上
D.85%以下,85%~95%,95%~100%,105%~115%

5.單項(xiàng)選擇題變量數(shù)列中,各組頻率之和應(yīng)()

A.小于1
B.等于1
C.大于1
D.不等于1

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