Standard deviation點graph??

[匿名]

2011-12-06 10:33 pm

問題如下:
You will calculate the average miles driven for each week as well as the standard deviation. Then you will construct a graph that shows the average miles for each week including the standard deviation.

我想問點graph個average同standard deviation?-_-
我印象中冇graph過wor...

回答 (1)

yuenwaima

2011-12-07 8:14 am

✔ 最佳答案

其實有graph是包括standard deviation

這條題目是要求變成normal distribution

然後找出mean和standard deviation

再利用Standard Normal Distribution Table進行畫圖

y-axis 為average miles

x-axis 為 Standard Normal Distribution

其實x-axis 已包含standard deviation，如果整個圖的散佈程度為99.7%，由mean開始出發，跟mean相差一個standard deviation，那個圖的面積就是整個圖的34%；跟mean相差兩個standard deviation，那個圖的面積就是整個圖的13.5%；跟mean相差三個standard deviation，那個圖的面積就是整個圖的2.35%。

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