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Statistics Ch 14
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Margin of error
The confidence level C determines the value of z* (in Table C).
The margin of error also depends on z*.
Higher confidence C implies a larger margin of error m (thus less precision in our estimates).
A lower confidence level C produces a smaller margin of error m (thus better precision in our estimates).
Impact of sample size
The spread in the sampling distribution of the mean is a function of the number of individuals
per sample.
The larger the sample size, the smaller the standard deviation (spread) of the sample mean distribution.
But the spread only decreases at a rate equal to √n.
Sample size and experimental design
The Power of a statistical test
the probability that the test will reject Ho at a significance
level α when Ha is true.
Type I error
Ho is rejected when it is actually true
Type II error
Failure to reject Ho when in fact Ha is true
Author
firefly501
ID
137618
Card Set
Statistics Ch 14
Description
Thinking about Inference
Updated
2012-02-25T18:17:20Z
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