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Data Session 6, Part C: Comparative Experimental Studies
Session 6 Part A Part B Part C Homework
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Session 6 Materials:

Session 6, Part C:
Comparative Experimental Studies

In This Part: Measuring Short-Term Recall | An Experiment | Experimental Design
Analysis of the Experiment

Here is one way to do the measurement.

Two lists are used:


List A contains 20 words of three characters each.


List B contains 20 non-words of three characters each.

To measure a person's ability to remember words (or non-words), each subject follows these steps:


Study the list for two minutes.


Pause for 20 seconds.


In one minute, list all the words or non-words that the subject can recall.

In this version of the experiment, we will show the list of non-words (List B) before the list of words. The subject's final score is the number of words (or non-words) he or she was able to correctly recall.

Try the experiment yourself, using the following Interactive Activity.

This activity requires the Flash plug-in, which you can download for free from Macromedia's Web site. To perform a non-interactive version of this activity, you'll need a subject and a timekeeper.


Problem C3


Think about the experiment design you described in Problem C1. Does the process you just went through (studying non-words, then writing non-words; studying words, then writing words) present any additional biases? How might you resolve any biases in your experiment design?

Stop!  Do the above problem before you proceed.  Use the tip text to help you solve the problem if you get stuck.
If you gave someone the same task twice, would you expect them to perform better, worse, or equally well the second time? If you did not answer "equally well," then that presents a source of bias for this experiment.   Close Tip

Next > Part C (Continued): Experimental Design

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