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6 Cards in this Set
- Front
- Back
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Degrees of freedom |
The difference between the number of measurements made and the number of parameters estimated.
estimating the mean (1 parameter) from 5 numbers leaves 4 degrees of freedom
The larger the degrees of freedom in an estimate, the more reliable the estimate |
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The larger the degrees of freedom |
the closer the t value comes to the z value |
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calculating a t value in independent samples |
t= (mean 1 - mean 2)/SD of the means |
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Calculating a t value in within subjects design |
Two measurement made in each subject
calculate change in each subject
t= mean change/ change expected by chance |
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Null hypothesis in a t test: |
The mean difference will be zero |
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The standard error is: |
Is an estimate of how reliable a mean value is large numbers of samples, small standard error
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