警方學(xué)員坐在一個(gè)黑暗的房間里，對(duì)著投影屏幕。十個(gè)不同的許可飛機(jī)被投影在屏幕上，一次一個(gè)，每次5秒，兩次試驗(yàn)間隔15秒。在最后15秒的時(shí)間間隔里，打開(kāi)燈，要求警察學(xué)員以任意次序?qū)懴掠^察到的盡可能多的10個(gè)牌號(hào)。隨機(jī)抽取試驗(yàn)中的15名學(xué)員參加了為期一周的記憶訓(xùn)練課程。然后，對(duì)他們進(jìn)行重新測(cè)試，正確號(hào)碼牌的數(shù)量結(jié)果如下表所示。
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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)？
Which of the following is best to show the percentage of a total budget that is spent on each category of items？（）
A cumulative frequency polygon is also called （）.
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)？
One advantage of a stem and leaf plot over a frequency distribution is that （）.
One rule that must always be followed in constructing frequency distributions is that （）.
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 （）.
變量數(shù)列中，各組頻率之和應(yīng)（）
Which of the following is not the goal of descriptive statistics?（）
品合格率指標(biāo)是（）