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
Card Set Information
Author:
firefly501
ID:
137618
Filename:
Statistics Ch 14
Updated:
2012-02-25 18:17:20
Tags:
statistics
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Description:
Thinking about Inference
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