The chi-square distribution is used to model three different types of tests:
1. Goodness-of-Fit Test
H0: The sample is from the specified distribution.
Ha: The sample is not from the specified distribution.
2. Test of Independence
H0: The variables are independent of each other.
Ha: The variables are not independent of each other.
3. Comparing Proportions of Multiple Independent Samples
All three models can be computed using ROV BizStats (see Figure 9.28).
Figure 9.28: Chi-Square Tests in ROV BizStats