Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Discrimination guidelines to determine whether the question should be rejected or improved
| Item difficulty | |||
|---|---|---|---|
| Item discrimination (d) | High | Medium or moderate | Low (easy) |
| d 0.0 | Improve or reject | Improve or reject | Improve or reject |
| 0.0 < d 0.30 | Accept | Improve or reject | Accept |
| d > 0.30 | Accept | Accept | Accept |
