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Unformatted text preview: The Dependent t Types of 2 sample t • The two sample ttest is used to test whether population means are equal, e.g., do training and control groups have the same mean. • The two samples can be independent or dependent. – They are independent if participants are randomly assigned to one and only one group. – They are dependent if participants are paired somehow across groups Some Dependent Samples • Repeated measures – Same person is in both groups, both trained and control (before, after) • Family members – Brother, sister – Husband, wife • Friends • Trials – Left hand, right hand – Left eye, right eye Computing the dependent t diff X SE D t D = pairs D diff n SD SE = Here are the formulas. Dependent t is easy to compute. First you find the difference between each pair of scores. You find the mean and standard deviation of those differences and plug them into the formulas. TA DA! Example dependent t Pair Y 1 Y 2 Diff 1 4 2 2 2 2 31 3 8 7 1 4 6 6 5 4 3 1 4.8 4.24....
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This note was uploaded on 05/21/2011 for the course PSY 3213 taught by Professor Staff during the Fall '08 term at University of South Florida.
 Fall '08
 Staff

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