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Tests Between Means of Related Groups
FSE 200
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What You Will Learn in Chapter 11
When to use a t test for dependent means How to compute the observed t value How to use the TTEST and TDIST functions How to use the t test Toolpak tool to compute the t value Interpreting the t value and what it means
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t Tests for Dependent Samples
Determining the correct statistic
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Computing the Test Statistic
Numerator reflects the sum of the differences between two groups
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Degrees of Freedom Degrees of freedom approximate the sample size
Degrees of freedom can vary based on the test statistic selected For this procedure… n – 1 (where n is the number of observations)
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So How Do I Interpret… t(24) = 2.45, p > .05
t represents the test statistic used 24 is the number of degrees of freedom 2.45 is the obtained value (from the formula) p > .05 indicates the probability
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TTEST Function TTEST does not compute t value
It returns the probability of that value occurring
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TTEST Function
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TTEST Function
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Using the Toolpak for t Values
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Using the Toolpak for t Values
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Summary of Important Data
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Acknowledgement The majority of the content of these slides were from the Sage Instructor Resources Website
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