W8 Practice Quiz questions Flashcards
1
Q
When would we expect to reject the null hypothesis when performing a Chi-square test?
A
When there are significant differences between the observed values and the values we would expect if there was no association between the two variables.
2
Q
How to calculate the degrees of freedom for a Chi-square test
A
df = (R - 1) x (C - 1)
3
Q
What conditions must be met in order for us to be able to do a Chi-square test?
A
- The observations must be independent from one another.
- Each observation must only appear once
- No more than 20% of cells have an expected value that is lower than 5.
4
Q
in what conditions should we use a Chi-square test?
A
The Chi-square test tests whether two categorical variables are associated or not.
5
Q
What is the definition of the degrees of freedom for a Chi-square test?
A
The number of cells in the contingency table that are free to vary.
6
Q
what variables do we test in a Chi-squared test?
A
two categorical variables
