Combined variance (two groups, means known) (Pooled spread includes between-group mean shift)
jee-mainjee-advanced
Pooled spread includes between-group mean shift
What each symbol means
| Symbol | What it stands for |
|---|---|
| d_i | Group mean minus combined mean |
| \sigma_i^2 | Group variance |
When to use this
Requires each group's variance and mean; d uses combined mean.