Chi-squared Test Flashcards
1
Q
Where are chi squared tests stored
A
Contingency table
Or two way table
2
Q
What is the observed values
A
The actual frequency data gathered
3
Q
What is expected values
A
What the frequency data would be if there was no association
4
Q
How to get an expected value
A
Assume there is no association, independent variables
Row total x column total/ grand total
5
Q
When does chi squared tests loose accuracy
A
When the expected values are less than 5
6
Q
Chi squared =
A
Summation of (O-E)^2/E
7
Q
How to work out the degrees of freedom
A
(Rows -1) x (columns - 1)
8
Q
How to then find the critical value
A
Take away the significance level from 100
That’s the p value
The use the degrees of freedom and find the value in the table
9
Q
If the test statistic is higher than the critical value then
A
Reject the null.
