Chi Square

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  • Created by: xoemmamcl
  • Created on: 24-11-17 20:55
What is Nominal Data?
It is categorical data. Discrete named categories. How many in each category? Frequency or %.
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What is a Chi Square?
It tells us how well data fits the null hypothesis (expected frequencies). Small x2 - data fits H0 Large x2 - data does not fit h0.
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What are Expected Frequencies?
Frequencies are expected if the null hypothesis were true. May reflect no preference or no difference from a comparison population.
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What are observed frequencies?
Frequencies that have been actually obtained from a sample.
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Observed Frequencies Significance
p .05 NOT SIGNIFICANT, observd freq do not differ from expected, sample fits distribution.
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What is the Chi Square test of goodness of fit?
Compares the frequencies of categories within one nominal variable.
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What are the assumptions of a chi square?
Nominal data, independent observations, expected frequencies.
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What is the Test of Association?
This tests for association between two nominal variables.
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Other cards in this set

Card 2

Front

What is a Chi Square?

Back

It tells us how well data fits the null hypothesis (expected frequencies). Small x2 - data fits H0 Large x2 - data does not fit h0.

Card 3

Front

What are Expected Frequencies?

Back

Preview of the front of card 3

Card 4

Front

What are observed frequencies?

Back

Preview of the front of card 4

Card 5

Front

Observed Frequencies Significance

Back

Preview of the front of card 5
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