證券分析人員為了研究資金運用效率對制造商收益的影響,隨機抽取了5個公司,得到如下資料:
要求計算:
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最能反映離散程度的指標是()
什么是季節(jié)變動?研究它的意義何在?如何測定季節(jié)變動?
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 ().
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 approximate range of the number of phone calls arriving each hour?()
The number of class intervals in a frequency distribution is usually between ().
Which of the following is not the goal of descriptive statistics?()
為什么在計算平均指標的基礎(chǔ)上還有必要進一步計算變異指標?
One advantage of a stem and leaf plot over a frequency distribution is that ().
要了解某地區(qū)全部大學(xué)生的就業(yè)情況,那么()
以2000年a0為最初水平,2016年an為最末水平,計算鋼產(chǎn)量的年平均發(fā)展速度時,須開()