# Digit Span Evaluation: Summary

You have now completed the module on evaluating digit span and recency research. The most important ideas about this are:

- In order to draw firm conclusions about the functioning of memory, Psychologists need to conduct their experiments with representative samples.
- However, the samples used in the research you have looked at consisted mainly of undergraduate students, who are not representative of the general population.
- Therefore, the research you have examined lacks sampling validity, and the results may not apply to all people.

## Where Next?

Topic | Level | What's this? |
--- | --- | --- | ---
Test | All | Finish learning about the capacity of STM and test your knowledge |