Chi-square and t-tests Flashcards
which test is used for proportions with more than 2 levels
chi-square goodness of fit test
which test is used for comparing proportions across two or more groups?
chi-square test of association
Which test is used for comparing a measure with a fixed value?
one sample t-test
which test is used for comparing a measure across two groups
ANOVA
what is chi-square test?
- A test of difference among categorical (nominal/ordinal) variables
What are the two types of chi-square test?
- goodness of fit
- test of association
what is the chi-square goodness of fit test?
tests how the proportions in data fit to fixed (expected) proportions. Can test more than two categories
What is the chi-square test of association
tests how proportions of two data sets are associated
How are results typically reported for goodness of fit test?
- result is the x2 value for df (degree-of-freedom) followed by p-value.
- Normally a bigger x2 means a bigger difference
How are results typically reported for test of association?
reported by chi-square value with df and N (number of samples), followed by p-value
What is the paired samples McNemar’s test?
Paired samples mean that, data points are paired across two groups
what do t-tests test?
Difference in group of measures (interval or ratio variables). Compare means of populations
What are the three types of t-tests?
One-sample t-test
Independent (unpaired) samples t-test
Paired samples t-test
Example of one sample t-test
Chi-square goodness of fit
Example of independent sample t-test
Chi-square test of association
