Table of Contents
Measurement Concepts
We've analyzed two types of variables
From one of our surveys
Another type of variable
Another Survey Item
The Earlier Tattoo Survey
Appropriate Summary Statistics
Margin of Error
What factors affect margin of error?
Sample size and margin of error
Natural Variability and Margin of Error
Sampling method and margin of error
Errors not measured by margin of error
Bias
Usually can't estimate amount of bias
A situation where bias can be estimated
Lack of Validity
Lack of Reliability |
Author: Bob Heckard
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