Tests Between Means of Related Groups

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Presentation transcript:

Tests Between Means of Related Groups FSE 200

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

t Tests for Dependent Samples Determining the correct statistic

Computing the Test Statistic Numerator reflects the sum of the differences between two groups

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)

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

TTEST Function TTEST does not compute t value It returns the probability of that value occurring

TTEST Function

TTEST Function

Using the Toolpak for t Values

Using the Toolpak for t Values

Summary of Important Data

Acknowledgement The majority of the content of these slides were from the Sage Instructor Resources Website