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Hypothesis testing –Revisited A method for deciding whether the sample that you are looking at has been changed by some type of treatment (Independent.

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Presentation on theme: "Hypothesis testing –Revisited A method for deciding whether the sample that you are looking at has been changed by some type of treatment (Independent."— Presentation transcript:

1 Hypothesis testing –Revisited A method for deciding whether the sample that you are looking at has been changed by some type of treatment (Independent Variable IV) Looking at how likely it is that a sample like the one that you have would be selected at random (without the benefit of treatment).

2 Sampling Distribution Mean values of all possible samples. Frequency How many samples  xx

3 Sample means Z scores H1H1 H1H1 p = <.025

4 Sample means Z scores H1H1 H1H1 Z = is more extreme than -1.96

5 Sample means Z scores H1H1 H1H1 p = >.025

6 Sample means Z scores H1H1 H1H is less extreme than 1.96 Z = 1.96


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