PSYC 218 Chapter 14: Chapter 14.docx
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The null and alternative hypotheses: we are looking at two means, h0: mx my = 0 (i. e. the two means are equal, e. g. mx dyslexics reading off white paper, my dyslexics reading off blue paper, ha: mx my 0 (i. e. the two means are not equal, here the null is rejected if the difference between the two means is so great that it is unlikely to be due to chance. Then do it over and over again until you have a frequency distribution of the difference between loads of x means and y means: frequency distribution of (xbar ybar, if the population mean is 0 then the sampling distribution of differences will be 0 too (mx bar my bar = 0, if the sampling distribution is normal so will the distribution of pairs of means be, the central limit thermo also applies to the distribution of the difference between sample means.
