June 2024
Intermediate to advanced
200 pages
4h 46m
Japanese
Content preview from Python2年生 データ分析のしくみ 第2版 体験してわかる！会話でまなべる！
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151
自然なばらつき
LESSON
16
正規分布は計算で求めることができる
次は、この正規分布の「計算で形を求めることができる」という側面を見てみましょう。
「平均値」がわかれば、「正規分布の左右の位置」がわかります。例えば、平均値が
-2、
0、2のとき、このように左右に移動します。
「標準偏差」がわかれば、「正規分布のカーブのとがり具合」がわかります。標準偏差が
小さければ急なカーブに、大きければゆるやかなカーブになります。例えば、標準偏差が
0.5、1、2のとき、このように変化します。
つまり、「平均値と標準偏差がわかれば、正規分布の形がわかる」ということです。例え
ば、あるクラスの身長の「平均値が
166.8cm、標準偏差が5.8cm」だとわかれば、「どのよ
きれいに移動しているね
平均値、標準偏差で
正規分布の形が見え
てくるんだ
Chapter
5
152
うな正規分布になるのか」がわかります。
計算でカーブの形がわかるということは、そのカーブで囲まれた「ある範囲の面積」を
計算で求めることもできます。例えば、「真ん中（平均値）から、前後に標準偏差までの範
囲」の面積もわかります。全体の約
68%です。ヒストグラムは、面積がデータ量を表して
いますから、この「面積の割合」はつまり「データの割合」です。「真ん中（
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.