Class notes chi squared test
10 important questions on Class notes chi squared test
When doe you use the chi squared test?
How do you calculate the chi factor?
What are the hypotheses of a chi squared test?
Ha: the variables are dependent
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If you want to perform a chi squared test, you have to label the frequency variable, how do you do this?
- Go data, and go to weight cases
- check weight cases and drag frequency variable to frequency variable
- run syntax
How to perform a chi squared test in spss?
- Analyze --> descriptive statistics --> crosstabs
- put one variable in collumns, and the other in rows.
- go to statistics and check chi squared test
- go to cell tabs and check observed and expected
- run the syntax
What are the assumptions of the chi squared test?
- Both variables are categorical
- independency, each person only fills one cell in the table, so no repeated measures.
- no expected values of zero
- not too many expected values below 5
How do you interpret the results of a chi squared test?
- The table named chi squared test
- check the significance of pearson's chi squared test.
What does the odds ratio tell us?
What is H0 in a standarisation check?
What happens when someone commits the base rate fallacy?
- 75% of cats are black
- 45% of rats are black
- rex is black
- so rex is probably a rat
- the amount of rats overal is way more than the amount of cats, so the chance of rex being a rat is bigger than the chance of rex being a cat, given that he's black
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