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10:52
Khan Academy
Sal Khan
Sampling distribution of the sample mean
Take a sample from a population, calculate the mean of that sample, put everything back, and do it over and over. No matter what the population looks like, those sample means will be roughly normally distributed given a reasonably large sample size (at least 30). This is the main idea of the Central Limit Theorem — the sampling distribution ...
Feb 20, 2011
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