某企業(yè)準(zhǔn)備用3種方法組裝一種新的產(chǎn)品,為確定哪種方法每小時(shí)生產(chǎn)的產(chǎn)品數(shù)量最多,隨機(jī)抽取了30名工人,并指定每個(gè)人使用其中的一種方法。通過(guò)對(duì)每個(gè)工人生產(chǎn)的產(chǎn)品數(shù)進(jìn)行方差分析得到下面的結(jié)果:
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One advantage of a stem and leaf plot over a frequency distribution is that ().
The number of phone calls arriving at a switchboard each hour has been recorded and the following frequency distribution has been developed.What is the cumulative frequency of the third class?()
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()
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 ().
If the individual class frequency is divided by the total frequency, the result is the ().
什么是季節(jié)變動(dòng)?研究它的意義何在?如何測(cè)定季節(jié)變動(dòng)?
在組距數(shù)列中,下限就是()
One rule that must always be followed in constructing frequency distributions is that ().
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()
時(shí)間序列構(gòu)成因素有哪些?分解的基本原理和思路是什么?