Post on 30-Dec-2015
description
Distribution of Sample Means, the Central Limit Theorem
• If we take a new sample, the sample mean varies. Thus the sample mean has a distribution, called the sampling distribution.
• Central Limit Theorem says that as sample size, n, gets larger, the distribution of sample means is approximately– Normal, and has– Same mean as original distribution; that is, Mean = – Standard deviation = original standard deviation over square root
sample size; that is, Standard Deviation =
Normal with varied µ and σ = 1
Normal with varied σ and µ = 0
Standard Normal with µ = 0 and σ = 1
Symmetric: Mean = 0
Stretches from about -3 to 3