Summary of Statistical Tests |
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Method |
Groups |
Scale of Measurement |
Purpose |
z test |
1 |
Interval |
Test means |
t test |
1 |
Interval |
Test means |
Independent groups |
2 |
Interval |
Difference between 2 means |
Dependent groups |
2 |
Interval |
Difference between 2 means |
F test for variance (Scheffé) |
2 |
Interval |
Find differences between variances |
ANOVA |
2 or more |
Interval |
Differences among means |
Chi square |
1 or more |
Nominal |
Determine if observations = frequencies or if variables are associated |
Correlation (Pearson r) |
2 |
Interval |
Degree of relationship |
Correlation (Rank Order) |
2 |
Ordinal |
Degree of relationship |
Correlation (Point Biserial) |
2 |
X interval, |
Degree of relationship |
Correlation (Phi) |
2 |
Nominal |
Degree of relationship |
(after Young & Veldman, 1981, p. 538) |