Flashcards
Chi-square & one-sample chi-square
Cards in this deck (12)
- 1What does a Chi-square (χ2) test do?- Measures statistical associations between 2 nominal variables
- tests the probability of finding differences as extreme as obtained (or more extreme) between the observed and expected frequency counts, if the null hypothesis is true - 2How many categories should one person's data fall into?1
(1 cell in a contingency table) - 3What is the H0 of a Chi-sqaure?That the groups have the same underlying association with that characteristic
(The expected frequency) - 4What is the H1 of a Chi-sqaure?Whether or not two (or more) groups differ in association to some characteristic
- 5How is the expected frequency calculated?Expected frequency is calculated for each cell
Row total x column total / overall total - 6How is Chi-square calculated?χ2 = ∑ (O−?)2 /?
For each cell: observed frequency - expected frequency, squared / expected frequency
χ2 = the sum of each calculation - 7What are the degrees of freedom for Chi-square?(r-1) x (c-1)
r = no.of rows
c = no. of columns - 8How do you get the p value for Chi-square?Using a table, online calculator or SPSS
- 9When can a directional hypothesis be tested using a Chi-square test?When there is a 2x2 design
- 10How is Chi-sqaure reported?χ2(df) = test stat, p = .xxx
- 11What are the assumptions of a Chi-square test?- Each participant/item/entry must only contribute to just 1 cell
- Generally not suited to repeated measures
- More than 5 frequencies in each cell (>5 = less reliable) - 12How do you do a one-sample Chi-square test?The same formula as the chi-square
BUT
Expected frequencies = N / no. of categories
Degrees of freedom = no.of categories - 1
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- Psychology (PS1813 - Research methods) Flashcards on Chi-square & one-sample chi-square, created by Sian Allen on 27/05/2022.
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- Sian Allen
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