T-Tests and Chi-Squared Tests Flashcards
1
Q
What are paired and unpaired samples in T-tests?
A
Paired are matched whereas unpaired are independent
2
Q
What is a t-test?
A
Tells you how significance the difference between groups are
3
Q
What assumptions do you make during a T-test?
A
Scale of measurement Random sampling Normality of data distribution Adequacy of sample size Equality of variance in standard deviation
4
Q
What is the chi squared test?
A
Tests for an association between 2 categorical variables
5
Q
How does the chi squared test work?
A
Calculates rocketed frequencies and compares them with the observed ones
If observed frequencies are very different to expected, this provides evidence that there is an association
6
Q
What does the chi squared test assume?
A
Large sample size
80% of the frequencies must be greater than 5
7
Q
How to do a chi squared test?
A
Always use frequencies
Use computer programmes
