PSYC 210 Chapter Notes -Normal Distribution, Confidence Interval, Null Hypothesis
14 Oct 2012
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Distribution of means distribution of means of samples of a given size form a population; comparison distribution when testing hypotheses involving a single sample of more than one individual. Mean of a distribution of means ( m) the mean of a distribution of means of samples of a given size from a population; comes out to be the same as the mean of the population of individuals ( ); Variance of a distribution of means ( 2: variance of the population divided by the # of scores in each sample. Standard deviation of a distribution of means ( m) square root of the variance of a distribution of means; also called standard error of the mean (sem) or standard error (se) Use the normal curve table: one-tailed cutoff at 5% 1. 64, two-tailed cutoff at 5% 1. 96, determine your sample"s score on the comparison distribution, decide whether to reject the null hypothesis.
