Unformatted text preview: 2. Move everything to one side: After  Before > 0. 3. Call the difference you have on the left side D: D = After  Before > 0. 4. Convert to proper notation: 5. Compute the new variable D and be sure to follow the order you have defined in step 3. Do not simply take the smaller away from the larger. From this point, you can think of having a new set of values. Technically, they are called D, but you can think of them as x. The original values from the two samples can be discarded. 6. Find the mean and standard deviation of the variable D. Use these as the values in the ttest from chapter 9....
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 Spring '08
 AKBAS
 Statistics, Mean, new variable, dependent case

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