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11-10-08 - Psychology 206 Class Notes Z-Test Logic Parent...

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Psychology 206 – Class Notes – 11/10/08 Z-Test Logic Parent Population – a population from which we can take a sample – it’s the population that a sample can be taken from – it’s the same as the population value It’s difficult to acquire data for all members of the parent population, so we take a sample. How likely is that the sample mean was taken from the parent population? o We are making an inference about the population mean based on the sample mean. We will know the true mean and population of the population (which is not realistic, but for the purpose of the Z-test, this is the case) IMPORTANT (for hypothesis testing): When looking at the problems, we approach the problem with the idea that the given sample mean does NOT come from the parent population, but WE ASSUME (for the Null Hypothesis [H0] that it DOES!!!!!). Null Hypothesis How likely is it that the mean of the parent population is 100?
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