**MISSION 99**

# Chi-squared tests

Learn how to apply the chi-squared test to determine if observed data follows an expected pattern.

#### Objectives

#### Mission Outline

1. Observed and expected frequencies

2. Calculating differences

3. Updating the formula

4. Generating a distribution

5. Statistical significance

6. Smaller samples

7. Sampling distribution equality

8. Degrees of freedom

9. Increasing degrees of freedom

10. Using SciPy

11. Next steps

12. Takeaways