P-value%20notes - 20 40 60 80 100 1 2 3 4 5 6 7 8 9 10 11...

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Unformatted text preview: 20 40 60 80 100 1 2 3 4 5 6 7 8 9 10 11 12 20 40 60 80 100 1 2 3 4 5 6 7 8 9 10 11 12 20 40 60 80 100 1 2 3 4 5 6 7 8 9 10 11 12 20 40 60 80 100 1 2 3 4 5 6 7 8 9 10 11 12 20 40 60 80 100 1 2 3 4 5 6 7 8 9 10 11 12 20 40 60 80 100 1 2 3 4 5 6 7 8 9 10 11 12 S1 S2 S5 S3 S4 AVERAGE SESSIO T i m e t o r e a c h g o a l ( s e c o n d s ) The “Learning Curve” Group Designs: Significance Testing Take a sample of the population and test it on some measure. Based on your findings, extrapolate to the population. So, you test a small sample to learn something about the population level effect. Group Designs EXAMPLE: Does a new teaching method improve reading scores? You have two groups of 20 preschoolers each. The Blue Group learns according to a new teaching method, and The Yellow Group learns according to the standard method. Ho: Any difference between the groups is due to chance. (There is zero “true” difference between the groups at the population level.) Ha: There is a difference between the two methods in terms of making kids learn to read faster. The Null Hypothesis p<.05 (Then some stats magic happens involving the differences between your data points and the number of data points you have, yielding a “p-value”) This p-value is the ESSENCE of most psychological testing, especially group designs p<.05p<....
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This note was uploaded on 04/11/2008 for the course EAB 3002 taught by Professor Yankelevitz during the Spring '08 term at University of Florida.

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P-value%20notes - 20 40 60 80 100 1 2 3 4 5 6 7 8 9 10 11...

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