# Chi-square assumption

## The chi-square assumption means at least five observations must be in every cell of the 2x2 table

There is one primary statistical assumption for

**chi-square**analysis. The chi-square assumption stipulates that there**has to be at least five observations in each cell of the 2x2 table associated with the analysis**. When the chi-square assumption is violated, then a__is the correct statistical test to use.__**Fisher's Exact Test****The unadjusted odds ratio with 95% confidence interval is still the primary inference**, regardless of using a chi-square or Fisher's Exact test. The*p*-value yielded from the statistical tests is not interpreted due to the lack of precision and accuracy in measurement and sampling error, especially with smaller sample sizes. The**width of the 95% confidence interval**determines the precision and accuracy of the inference yielded from these statistics.### Chi-square assumption and applied statistics

## Hire A Statistician

**DO YOU NEED TO HIRE A STATISTICIAN?**

Eric Heidel, Ph.D., PStat** **will provide the following statistical consulting services for undergraduate and graduate students at $100/hour. Secure checkout is available with Stripe, Venmo, Zelle, or PayPal.

- Statistical Analysis
- Research Design
- Sample Size Calculations
- Diagnostic Testing and Epidemiological Calculations
- Survey Design and Psychometrics