chi squared test Flashcards
1
Q
what is the purpose of the chi squared test
A
to determine whether there is a significant difference between o9bserved and expected frequencies in a category of data.
2
Q
what is a null hypothesis
A
no significant difference between 2 sets of data
3
Q
what is the chi squared equation
A
x^2= sum of (O-E)^2/ E
where O is observed
E is expected- MEAN
4
Q
what are the steps of chi squared test
A
step 1- O-E
step 2- (O-E)^2
step 3- (O-E)^2/E
REPEAT for all values
degrees of freedom = n-1 where 2 is number of categories.
step 4- compare to critical value.
