Choosing A Statistical Test Flashcards
Statistical testing
Used in psychology to determine whether a significant difference or correlation exists
Critical value
When testing a hypothesis the numerical boundary between acceptance and rejection of a no hypothesis
What are the 3 decisions when finding what stats test to use
- Difference or correlation
- Experimental design
- Levels of measurement
What is the nemonic used for remembering the stats table
Carrots Should Come
Mashed With Swede
Under Roast Potatoes
Chi-squ/Sign test/Chi-squ
Mann whit/Wilcoxon/Sperman
Unrelated/Related/Pearsons
Nominal data
A level of measurement where data or in separate categories
Ordinal data
A level of measurement where data are ordered in some way (ranked)
Interval data
A level of measurement where units or equal intervals are used (continuous)
What are the 2 requirements of the Chi squared test
- Test for correlation or difference
- Nominal data
Difference- Unrelated design
What is the calculated value sign for chi-squared test
X^2
What is the df for the chi-squared test
df = (rows - 1) x (columns - 1)
What are the 3 requirements of a sign test
- Test for difference
- Nominal data
- Related test (Repeated measures / matched pairs)
What are the 3 requirements of the Mann Whitney U test
- Test for difference
- Ordinal data
- Unrelated (Independent groups)
What is the critical value sign for Mann Whitney U test
U
What is the N value for Mann Whitney U test
There will be 2 N (participants) values due to there being 2 independent groups
What are the 3 requirements of the Wilcoxon T test
- Test for difference
- Ordinal data
- Related (repeated measures)
What is the calculated value sign for the Wilcoxon T test
T
What is the N value for the Wilcoxon T test
1 participant group so there will be 1 N value
What are the 2 requirements of the Spearman’s rho test
- Test for correlation
- Ordinal data
What is the calculated value sign for the Spearman’s rho test
rho
What is the N value for the Spearman’s rho test
1 participant group so there will be 1 N value
What are the 3 requirements for a Parametric test
- Interval data
- Normal distribution
- Homogeneity of variance
What are the 3 requirements of the Unrelated t test
- Test for difference
- Interval data
- Unrelated test (independent groups)
What is the calculated value sign for the Unrelated t test
t
What is the N/df value for the Unrelated t test
df = Na + Nb -2
