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)
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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)
A.任意調(diào)查
B.立意調(diào)查
C.配額抽樣
D.整群抽樣
最新試題
If the individual class frequency is divided by the total frequency, the result is the （）.
A cumulative frequency distribution would provide（）.
為什么在計(jì)算平均指標(biāo)的基礎(chǔ)上還有必要進(jìn)一步計(jì)算變異指標(biāo)？
要了解某地區(qū)全部大學(xué)生的就業(yè)情況，那么（）
One advantage of a stem and leaf plot over a frequency distribution is that （）.
某廠某年職工勞動(dòng)生產(chǎn)率為20000元，是歷史最高水平的1.2倍。這里的1.2倍是（）
品合格率指標(biāo)是（）
A summary measure that is computed from a sample to describe a characteristic of the population is 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 （）.
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 （）.