30.8 population 32.5  31.7 sample 30.5  30.1   30.4  31.6 Why is there a difference? 32.5  32.1 What is this difference called? 31.6 

​ 30.8 population 32.5  31.7 sample 30.5  30.1   30.4  31.6 Why is there a difference? 32.5  32.1 What is this difference called? 31.6   Read More

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