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This is where the volume shines. Real-world statisticians rarely know the population standard deviation. Instead, they use the sample standard deviation (s) and the T-distribution.

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[ z = \frac\hatp - p_0\sqrt\fracp_0(1-p_0)n ] Where: This is where the volume shines

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In the corporate world, Six Sigma and quality control specialists rely heavily on hypothesis testing and ANOVA to reduce defects in manufacturing. In the tech sector, A/B testing—comparing two versions of a webpage to see which performs better—is a direct application of the two-sample hypothesis tests covered in this volume. Furthermore, the regression techniques taught in the series are the exact starting point for data scientists building algorithms to predict consumer behavior or stock market trends.