Chi-square, correlation
9 important questions on Chi-square, correlation
When do you use the Chi-square test (X^2)?
How do you calculate the degrees of freedom?
What are characteristics of the Chi-square?
- Different questions can lead to different expectations
- think carefully about your expected values
- always obervations agains expctations: do the data match expected ratio?
- Null hypothesis: observations and expectations are the same
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When do you use a pearson correlation coefficient (parametric test)?
- normally distributed data
- linear relationship between variables
When do you use a spearman rank correlation coefficient (non-parametric test)?
- Can always be used: not-normally distributed data
- for relationship between ranks
How do you calculate the standard error of r?
What does the ratio that you find in the output of a Fisher’s exact test indicate?
When is the Chi-test a suitable replacement for the Fisher's test?
- Fisher’s exact test may be computationally infeasible for large sample sizes
- the accuracy of the Chi-squared test increases with sample size
What does a borderline correlation suggest?
The question on the page originate from the summary of the following study material:
- A unique study and practice tool
- Never study anything twice again
- Get the grades you hope for
- 100% sure, 100% understanding
