# Independent Sample Tests - Comparing Two Means

The tests employed depend upon:

- Whether a weight is or is not applied (or, equivalently, a
*design effect*has been specified). - Settings in Statistical Assumptions (in addition to the settings below, tests are not conducted when a group has a sample size less than the number specified in
**Minimal sample size for testing**).

If viewing Column Comparisons and an ANOVA-Based Column Comparison test has been selected in Multiple comparison correction then:

- Multiple comparison correction=
**Fisher LSD**: Multiple Comparisons t-Test (Fisher LSD) - Multiple comparison correction=
**Tukey HSD**: Tukey HSD - Multiple comparison correction=
**Dunnett**: Dunnett’s Pairwise Multiple Comparison - Multiple comparison correction=
**Duncan**: Duncan’s New Multiple Range Test - Multiple comparison correction=
**Bonferroni (Pooled t-Test)**: Multiple Comparisons t-Test with Bonferroni Correction - Multiple comparison correction=
**Newman-Keuls (S-N-K)**: Newman-Keuls (S-N-K) - Multiple comparison correction=
**False Discovery Rate (pooled t-test)**: Multiple Comparisons t-Test with False Discovery Rate Correction

Else:

- Means =
**Non-parametric**: Kruskal-Wallis Test - Means =
**z-test**:

- If the data is weighted: Independent Complex Samples Z-Test - Comparing Two Means
- If the data is not weighted:
- If the sample size in either group is less than
**Equal variance in tests when sample size is less than**: Independent Samples Z-Test - Comparing Two Means with Equal Variances - Else: Independent Samples Z-Test - Comparing Two Means with Unequal Variances

- If the sample size in either group is less than

- Means =
**t-test**:

- If the data is weighted: Independent Complex Samples t-Test - Comparing Two Means
- If the data is not weighted:
- If the sample size in either group is less than
**Equal variance in tests when sample size is less than**: Independent Samples t-Test - Comparing Two Means with Equal Variances - Else: Independent Samples t-Test - Comparing Two Means with Unequal Variances

- If the sample size in either group is less than

- Means =
**Quantum Means**: Independent Samples - Quantum Column Means Test - Means =
**Survey Reporter Means**: Independent Samples - Survey Reporter Column Means Test