Syllabus point — Maths Interactives

Understand the concept of the sample mean X̄ as a random variable whose value varies between samples where X is a random variable with mean μ and the standard deviation σ.

u4-t5-s1-d1

Interactive

Building the distribution of x̄

manipulative

Draw repeated samples of size n from a skewed (exponential) population and watch the histogram of sample means x̄ narrow and approach normality.

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