Chapter 7: The Distribution of Sample Means

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purpose of the sample mean

is the sample mean representative of the population mean?

sampling error

natural discrepancy b/w a sample stat and its corresponding pop parameter

definition of the dist of sample means

the collection of sample means for all the possible random samples of a particular size that can be obtained from a pop

characteristic of dist of sample means

sample means pile up around the population mean

central limit theorem

dist of sample means approaches a normal dist as n approaches infinity

when is the dist of sample means almost perfectly normal?

when the pop is normal; when the # of scores in each sample is relatively charge (at least 30)

expected value of M

mean of the distribution of sample means

standard error of M

the standard deviation of the sample means