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Problems and Exercises II
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Read the following description of psychological research carefully and then answer the questions that follow.

Description:

A researcher sets out to replicate the experiment described in Problem 1. However, the investigator adds a third variable to the complex design: length of story. Specifically, the investigator uses stories of the same length as in the original experiment and also prepares stories that are similar in content but are one-third longer. By doing this, the researcher hopes to avoid any ceiling effects in the recall of the sixth-graders. In order to test children efficiently, half the participants in this experiment are tested on both the non-disrupted and disrupted story using the original story length, and half are tested on both types of stories using the longer length. The investigator tests 80 children (40 second-graders and 40 sixth-graders) who were not in the previous experiment. Other procedures and measures are the same as those used in the original experiment.



1

Identify the three independent variables and the levels of each.
2

Why would the type of story variable need to be counterbalanced?
3

How many children will be tested on each length of story?
4

How many children will be tested at each level of story type (disrupted and non-disrupted)?





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