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distribution of means
distribution of means of samples of a given size from a particular population (also called a sampling distribution of the mean); comparison distribution when testing hypothesis involving a single sample of more than one individual TERM 2
variance of a distribution of means
DEFINITION 2 variance of the population divided by the number of scores in each sample TERM 3
mean of a distribution of means
DEFINITION 3 the mean of a distribution of means of samples of a given size from a particular population; it comes out to be the same as the mean of the population of individuals TERM 4
standard deviation of a distribution of means
(population SD m)
DEFINITION 4 square root of the variance of the distribution of means; same as standard error (SE) TERM 5
standard error (SE)
DEFINITION 5 same as standard deviation of a distribution of means; also called standard error of the mean (SEM)
shape of a distribution of means
contour for of a histogram of a distribution of means such as whether it follows a normal curve or is skewed; in general, a distribution of means will tend to be unimodal and symmetrical and is often normal TERM 7
Z test
DEFINITION 7 hypothesis-testing procedure in which there is a single sample and the population variance is known TERM 8
confidence interval (CI)
DEFINITION 8 roughly speaking, the region of scores (that is, the scores between an upper and lower value)that is likely to conclude that true population mean; more precisely, the range of possible population means from which it is not highly unlikely that you could have obtained your sample and mean TERM 9
confidence limit
DEFINITION 9 upper or lower value of a confidence interval TERM 10
95% confidence interval
DEFINITION 10 confidence interval in which, roughly speaking, there is a 95% chance that the population mean falls within this interval
