單項(xiàng)選擇題若隨機(jī)事件A與B滿足條件PAB=PAPB,則()

A.A與B相互獨(dú)立
B.A與B不獨(dú)立
C.A與B相互排斥
D.A與B相關(guān)


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1.單項(xiàng)選擇題統(tǒng)計(jì)學(xué)的兩大基本內(nèi)容是()

A.統(tǒng)計(jì)資料的收集和分析
B.理論統(tǒng)計(jì)和運(yùn)用統(tǒng)計(jì)
C.統(tǒng)計(jì)預(yù)測(cè)和決策
D.描述統(tǒng)計(jì)和推斷統(tǒng)計(jì)

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Which of the following is best to show the percentage of a total budget that is spent on each category of items?()

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Descriptive statistics deals with methods of()

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A cumulative frequency distribution would provide().

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企業(yè)生產(chǎn)一種產(chǎn)品需順次經(jīng)過四個(gè)車間,這四個(gè)車間的廢品率分別為1.5%、2.0%、2.0%和1.0%。該企業(yè)生產(chǎn)這種產(chǎn)品的平均廢品率是多少?

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If data are grouped into intervals and the number of items in each group is listed, this could be called a ()

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A student achieves an 82 on the first test in a statistics course. From this, she assumes that her average at the end of the semester (after other tests) will be about 82. This is an example of ().

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常用的長(zhǎng)期趨勢(shì)測(cè)定的方法有哪些?各有什么特點(diǎn)?

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