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Unformatted text preview: distribution converges to the population distribution mean Law of large numbers The larger a sample the more it will accurately reflect a population-the larger the sample size the smaller the standard error Z vs T Tests Z tests the standard deviation is KNOWN T tests the standard deviation is UNKNOWN *T STATISTIC ESTIMATES STANDARD ERROR BY USING THE SAMPLE STANDARD DEVIATION-in a T test the denominator and the numerator vary from sample to sample *Z TEST USES THE POPULATION STANDARD DEVIATION-the numerator varies from sample to sample the denominator is constant Degrees of freedom The number of items left in a sample that are free to vary...
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