Lecture+12+su10+_related+samples+t+test_

Lecture+12+su10+_related+samples+t+test_ - Sociology 210...

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02/23/11 SOC 210 summer 2010 1 Sociology 210 Lecture 12: The t Test for Two Related Samples
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02/23/11 SOC 210 summer 2010 2 Related Samples Two main types of research designs where this method is used 1. Repeated Measures 2. Matched Subjects
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02/23/11 SOC 210 summer 2010 3 Repeated-Measures Design Idea is that you observe the same sample at two different points in time, i.e. the same variables are being measured twice for each unit This type of design has big advantages over the independent samples design we covered in the last lecture Change Over Time : It allows comparisons to be made before and after a treatment has been administered Spuriousness : It reduces the spurious influences of other variables – what the textbook calls “individual differences” (“fixed” characteristics of people that do not change over time)
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02/23/11 SOC 210 summer 2010 4 Does Capitalism affect women’s labor force participation? With an independent measures design , you would compare the dependent variable (women’s labor force participation) across different levels of the categorical variable (whether or not the country has a Capitalist system) Problem: If there is a difference in women’s labor force participation between capitalist and non-capitalist countries, how do you know that the difference is really being explained by the presence/absence of capitalism? There could be other influences that make capitalist countries different from non-capitalist countries. But inevitably, there are going to be some factors that you can’t control for because you may not be able to measure them – this is the problem of spuriousness Example
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This note was uploaded on 02/21/2011 for the course SOCIOLOGY 210 taught by Professor Ybarra during the Summer '10 term at University of Michigan.

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Lecture+12+su10+_related+samples+t+test_ - Sociology 210...

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