Chapter 5 Vocabulary 1
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 ( µM ) – 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 (µ);
Variance of a distribution of means (δ M ) – variance of the population divided by the # of scores in each sample
Standard deviation of a distribution of means (δ M) – square root of the variance of a distribution of means; also
called standard error of the mean (SEM) or standard error (SE)
Z test – hypothesis-testing procedure in which there is a single sample and the population variance is known
1. Restate the question as a research hypothesis and a null hypothesis about the populations.
2. Determine the characteristics of the comparison distribution.
c. δM= √