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Introduction to t_Sp08_BBnocolor

Introduction to t_Sp08_BBnocolor - Outline Introduction to...

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1 The t-Distribution Outline Introduction to the t-distribution Normal distribution vs. t-distribution 1 Sample t-test – Example Introduction When do we ever know the standard deviation of the population ( σ )? – Can use σ M when testing hypotheses about the sampling means 1-Sample Z test Introduction When we don’t know σ , need to use the best estimator Estimated Standard Error (s M ) • Assumption: our sample is a random sample from the population – Variance of the sample should reflect the variance of the population
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