AP® Statistics · Unit 3 · Topic 3.15
Expected Counts and the Chi-Square Statistic
Watch it explained
- How it worksWalk me through the row total times column total over grand total rule for expected counts.
- Worked exampleFind the expected count for a cell with row total 120, column total 90, and 300 overall.
- Worked exampleFind the chi-square statistic for a 2 by 3 table with counts 30, 45, 25, 50, 35, and 15.
Check yourself
Your turn1 of 2
A two-way table cell has a row total of 144, a column total of 121, out of a grand total of 483. Find the expected count for that cell.End of topic.