Summary of Statistical Tests
| 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 (Scheffe’) |
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) |
