# Feb_14 - ECM Tutorials Feb 14-18 2011 Review We will...

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ECM Tutorials Feb 14-18, 2011 Review: We will continue learning hypothesis testing in this tutorial. 1. Last week we have learnt hypothesis testing for a population mean μ if we known population standard deviation σ . This week we will learn hypothesis testing for a population mean if we don’t know the population standard deviation. Step 1: What’s your H0 and H1? Step 2: Is it a one-tail or two-tail test? Step 3: What is your test statistic? With an unknown population standard deviation, test statistic is / n s x t - - = ~ T ( N -1). Here s is the sample standard deviation, which we can calculate from data. Step 4: What is the distribution of this statistic? ) 1 ( ~ - N T t . Step 5: What is your test conclusion? You can use rejection region to draw a conclusion. Step 6: Interpret your test conclusion. 2. Test the difference between two population means ( 2 1 = or 2 1 ). Q: What is the test statistics and what is the distribution of this statistic?

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## This note was uploaded on 05/17/2011 for the course ECO 220 taught by Professor Tanaka during the Spring '11 term at University of Toronto.

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Feb_14 - ECM Tutorials Feb 14-18 2011 Review We will...

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