Statistics › Section K · The chi-square distribution › Topic K.1
The chi-square distribution
Means are compared with t and proportions with z - but counts in categories need a new curve. The chi-square distribution prices how far observed counts depart from expected ones, and this topic meets the family before its tests put it to work.
In this topic
- A curve for counts
- The chi-square idea: squared distances
- The distribution's shape
- One parameter: degrees of freedom
- Mean and spread
- Growth toward symmetry
- Worked example: reading a statistic against its df
- Worked example: a first statistic
- Common mistakes to avoid
- Key takeaways
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