STAT 8010 Lecture Notes - Lecture 11: Test Statistic, Algebraic Group, Statistical Hypothesis Testing
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Dependent (or matched-pairs) samples are usually more efficient and informative than are independent samples of equal size. For the dependent samples design, we try to select data in such a way as to minimize the variation contributed by extraneous variables. 2. when the sample element is a member of both populations, and/or when the comparison of the two populations is to be made with respect to a particular variable. Testing the effects of a diet by getting before and after weights on the same people. Testing the effectiveness of a teaching strategy by giving pretests and posttests to the same individuals. Testing two brands of tires for tread wear by placing one brand of each tire on the rear wheels of the same car. Example: ten plots of land are available to determine if a new genetically-engineered variety of corn will increase the yield.
