Choosing a statistical test Flashcards
Statistical tests
- used in psychology to determine if a significant difference or correlation exists
- if null hypothesis should be rejected or accepted
Statistical tests
List
Chi-squared Mann-Whitney Pearson’s r Related t-test Sign test Spearman’s rho Unrelated t-test Wilcoxon
Chi-squared
- test of difference or association/correlation
- nominal data
- unrelated design
Mann-Whitney
- test of difference
- ordinal data
- unrelated design
Pearson’s r
- test of association/correlation
- interval data
Related t-test
- test of difference
- interval data
- related design
Sign test
- test of difference association/correlation
- nominal/ordinal data
- related design
Spearman’s rho
- test of difference
- nominal data
- unrelated design
Unrelated t-test
- test of difference
- interval data
- unrelated design
Wilcoxon
- test of difference
- ordinal data
- related design
Factors to decide a statistical test
-Difference or correlation
-Experimental design
└related/unrelated
-Levels of measurement
└nominal, ordinal, interval
Factors to decide a statistical test
Difference or correlation
-evident from hypothesis
Factors to decide a statistical test
Experimental design
-related design
└repeated measures, matched pairs
-unrelated design
└independent groups
Related design
Examples
- repeated measures
- matched pairs
Unrelated design
Examples
-independent groups
Levels of measurement
List
Nominal data
Ordinal data
Interval data
Nominal data
-categories
Ordinal data
-ordered data
Interval data
-numerical data with equal intervals
