# Notes7b - 1 The Dependent t Types of 2 sample t The two...

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1 The Dependent t ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Types of 2 sample t • The two sample t -test 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 •F r i e n d s •T r i a

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2 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
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Notes7b - 1 The Dependent t Types of 2 sample t The two...

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