Y13 RESEARCH METHODS - TEST OF ASSOCIATION: Chi-squared

Question 1

Why chi?

Answer 1

• a test of difference or association
• data is nominal
• independent groups design

Question 2

summary of how to do Chi-squared test?

Answer 2

1. 2 x 2 contingency table
   totals for each row, column and overall total
2. work out the expected frequencies (E)
   work out O-E
   and(O-E)^2
   and (O-E)^2/2
3. work out calculated value/x^2
   4.calculate df
4. calc > critical = significant difference