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This video was created by OpenIntro (openintro.org) and provides an overview of the content in Section 4.6 of OpenIntro Statistics, which is a free statistics textbook with a $10 paperback option on Amazon.
This video introduces the main ideas behind hypothesis testing for a sample mean, including null and alternative hypotheses, using the normal distribution to approximate the sampling distribution of the sample mean, computing a p-value, decision errors, and one- and two-sided hypotheses.