BIOL361 Lecture Notes - Lecture 8: Parametric Statistics, Design Of Experiments, Test Statistic

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12 Apr 2016
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Means, variances paired (dependent) vs unpaired (independent) parametric vs non parametric. When comparing means of 2 samples to make inferences about differences between 2 populations. There are 4 main tests to choose from: Independent unpaired samples : the sample selected from one population is not related to the sample selected from the other population. Dependent paired samples: one sample is related to the other ( each subject in one sample is paired with a specific subject in the other sample) Value of one subject in the first group is expected to be more similar to a particular subject in the second group than to a random subject in the second group. Experimental design includes pairing (before results are collected) Set alpha = 0. 05: for each subject, each pair of data calc the change, difference, d in the variable. Keep track of the sign (- or +) d = x - y: calculate the mean difference and sd of the differences.

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