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Unit 5
hard to get a random sample sampling methods that by their nature tend to over or under emphasize some characteristics of the populations are siad to be biased |
Sample is a part of the population that we actually examine in order to gather information
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Bias: when outcomes are systemically favored the best way to reduce bias is to select individuals for the sample at random
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The entire group of individuals that we want information about is called the population
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Randomization can protect you against factors that you know are in the data, can also help protect against factors you are not even aware of
Randomizing protects us from the influences at all the features of our populations |
A census attempts to contact every individual entire population.
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