Chi-Square

Chi-Square

1. When to use Chi-square

   • The hypothesis predicts a difference or an association
   • The sets of data are independent
   • The data is nominal

2. How to use Chi-Square

   • Step 1. State the alternative and null hypothesis
   • Step 2. Draw up a contingency table
   • Step 3. Find the observed value by comparing observed and expected frequencies for each cell
   • Step 4. Add all the values in the final column
   • Step 5. Find the critical value of chi-square
   • Step 6. Sate the conclusion

3. gReateR

   • The observed value needs to be greater than the critical value