Chapter 12 Lecture

# Chapter 12 Lecture - Chapter 12 Analysis for Research...

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Copyright Atomic Dog Publishing, 2005 Chapter 12 Analysis for Research Design

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Copyright Atomic Dog Publishing, 2005 Inferential Statistics Process of trying to reach conclusions that extend beyond the immediate data “Inferring” information about the population from the sample data All are based on the general linear model (GLM)
Copyright Atomic Dog Publishing, 2005 Idealized Distributions for Treated and Control Group Posttest Values

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Copyright Atomic Dog Publishing, 2005 What Does Difference Mean? A statistical difference is a function of the difference between means relative to the variability . A small difference between means with large variability could be due to chance . Like a signal-to-noise ratio. Low variability Which one shows the greatest difference?
Copyright Atomic Dog Publishing, 2005 Three Scenarios for Differences between Means

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Copyright Atomic Dog Publishing, 2005 The t Assesses whether the means of two groups are statistically different from each other (i.e., whether there is a statistically significant difference between group mean scores) Assesses the difference in mean scores relative to the variability of scores (i.e, the standard error of the difference )
Copyright Atomic Dog Publishing, 2005 The t-Test Tests whether the means of two groups are statistically different from each other. One continuous dependent variable & on categorical independent variable. Can also have a paired t-test—difference between two scores on a single measure.

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Copyright Atomic Dog Publishing, 2005 The t -Test (cont’d) Determination of whether or not a t -value is large enough to be significant can be determined from a
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## This note was uploaded on 02/11/2011 for the course CHFD 5110 taught by Professor Johnson during the Spring '11 term at UGA.

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Chapter 12 Lecture - Chapter 12 Analysis for Research...

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