Starting off

The example we'll use in this chapter is a randomized controlled experiment investigating the effects of talking on a cell phone while driving. The dependent variable in the experiment is the number of driving errors that subjects made in a driving simulator. There are two independent variables:

Conversation difficulty: None, Low, High
Driving difficulty: Easy, Difficult

Each of the subjects was randomly assigned to one of six conditions formed by combining different values of the independent variables.

What is the number of factor levels for each independent variable?

Possible Answers

The independent variable conversation difficulty has three levels, and the independent variable driving difficulty has two levels.
The dependent variable conversation difficulty has three levels, and the dependent variable driving difficulty has two levels.
Both the independent variable conversation difficulty and the independent variable driving difficulty have six levels.
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Exercise

Starting off

Instructions

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