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# Unit 12: Inference for categorical data: Chi-square

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## About this unit

Learn to test how well sample counts of a categorical variable fit some hypothesized distribution, or, if the distribution of a categorical variable is similar or not across multiple groups.### Learn

### Practice

- Expected counts in a goodness-of-fit testGet 3 of 4 questions to level up!
- Conditions for a goodness-of-fit testGet 3 of 4 questions to level up!
- Test statistic and P-value in a goodness-of-fit testGet 3 of 4 questions to level up!
- Conclusions in a goodness-of-fit testGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 320 Mastery points

### Learn

### Practice

- Expected counts in chi-squared tests with two-way tablesGet 3 of 4 questions to level up!
- Test statistic and P-value in chi-square tests with two-way tablesGet 3 of 4 questions to level up!
- Making conclusions in chi-square tests for two-way tablesGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 240 Mastery points

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Level up on all the skills in this unit and collect up to 700 Mastery points!#### Unit test

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