Chi-Squared Test

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Last updated 3:11 PM on 4/14/26
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6 Terms

1
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What is the Chi-squared test

a statistical method of analysis to identify if the difference between observed and expected frequencies is ‘significant’

2
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What is statistical significance

a determination of if the results are influenced by an outside influence and not up to proability

3
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What is the critical value

a threshold that determines statistical significance

4
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what are the degrees of freedom

(the # of independant values) minus 1 [n-1]

5
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What do you do if results are expected or unexpected

  • If our results are expected, (insignificant, Ho is accepted)

  • if our results are unexpected, (significant, Ho is rejected)

6
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How to calculate Chi-squared test

= the sum of [(O - E) ²] / E —→ [(Observed - Expected)²] / Expected