A.側(cè)檢驗(yàn)
B.左側(cè)檢驗(yàn)
C.雙側(cè)檢驗(yàn)
D.上側(cè)檢驗(yàn)
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A.精確假設(shè)
B.非精確假設(shè)
C.復(fù)合假設(shè)
D.備擇假設(shè)
A.28.35小時(shí)
B.28.59小時(shí)
C.29.61小時(shí)
D.30.02小時(shí)
A.變量x的標(biāo)準(zhǔn)差
B.變最y的標(biāo)準(zhǔn)差
C.變量x和y兩標(biāo)準(zhǔn)差的乘積
D.變量x和y的協(xié)方差
A.算術(shù)平均數(shù)
B.中位數(shù)
C.眾數(shù)
D.調(diào)和平均數(shù)
A.2個(gè)
B.3個(gè)
C.4個(gè)
D.5個(gè)
最新試題
某企業(yè)的生產(chǎn)計(jì)劃完成百分比采用如下分組，請(qǐng)指出哪項(xiàng)是正確的（）
A cumulative frequency polygon is also called （）.
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 （）.
Descriptive statistics deals with methods of（）
如果居民按報(bào)告期價(jià)格購(gòu)買商品需多支出40萬元，報(bào)告期商品銷售額為200萬元，則價(jià)格指數(shù)為（）
Simon Arnett, Director of Human Resources, is exploring the causes of employee absenteeism at Buderim Bottling during the last operating year (1 January 2005 to 31 December 2005). Personnel records of 50 employees are selected for analysis. (The plant employs 250.) For this study, the average number days absent for these 50 employees is a （）.
某企業(yè)2018年技術(shù)工占50%，2019年新招收了一批學(xué)徒工，使學(xué)徒工的比重增加了10%。假定全廠各級(jí)工資水平均無變化，則2019年職工總平均工資將（）
The number of class intervals in a frequency distribution is usually between （）.
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（）
One advantage of a stem and leaf plot over a frequency distribution is that （）.