ADMS 2320 Study Guide - Squared Deviations From The Mean, Linear Regression, Explained Variation
6 May 2013
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In order to test and estimate the difference between two population means, we draw random samples from each of two populations. Is normally distributed if the (original) population distributions are normal. ; is approximately normally distributed if the (original) population is not normal, but the samples" size is sufficiently large (greater than 30). An f-test is a hypothesis test that revolves around the variance; its used to find out if the variances of 2 populations are equal or unequal. In a matched pair experiment, there is a logical tie between the two data sets. We list the raw data for group a and the group b beside each other, and then we subtract the pair to get the differences column (group a1 b1= d1 ). We then compute the sample mean, sample standard deviation, and sample. An unbiased estimator of p1 p2 is p 1 p 2 (the difference between the sample proportions).
