Test of Association: Chi-squared (AQA A-Level Psychology): Flashcards
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Practise the cards
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What does the chi-squared test examine?
What does the chi-squared test examine?
Association or difference between variables
What type of data is used in chi-squared test?
What type of data is used in chi-squared test?
Nominal (categorical) data as frequency counts
What design type is used in chi-squared test?
What design type is used in chi-squared test?
Unrelated design (independent groups)
Formula for expected frequency
Formula for expected frequency
(Row total × Column total) / Overall total
Chi-squared formula
Chi-squared formula
χ² = Σ(O-E)²/E
What does O represent in chi-squared formula?
What does O represent in chi-squared formula?
Observed frequency
What does E represent in chi-squared formula?
What does E represent in chi-squared formula?
Expected frequency
Formula for degrees of freedom (df)
Formula for degrees of freedom (df)
(no. of rows - 1) × (no. of columns - 1)
When to reject null hypothesis in chi-squared
When to reject null hypothesis in chi-squared
When calculated χ² > critical value
What p-value indicates statistical significance?
What p-value indicates statistical significance?
p < 0.05