填空題反映順序變量數(shù)據(jù)的集中趨勢的指標可以用()數(shù)或()數(shù)來測度。
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品合格率指標是()
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對全國各鐵路交通樞紐的貨運量、貨物種類等進行調(diào)查,以了解全國鐵路貨運概況。這種調(diào)查屬于()
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Which of the following is not the goal of descriptive statistics?()
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