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Psychology 206 – Class Notes – 11/10/08
ZTest 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 Ztest, 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?
•
Stating the Null Hypothesis
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This note was uploaded on 06/03/2009 for the course PSYCH 206 taught by Professor Kenneybenson during the Fall '07 term at Allegheny.
 Fall '07
 KenneyBenson
 Psychology

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