A researcher testing whether the number of bystanders affects the likelihood of helping sets up three conditions: no bystanders, two bystanders and four bystanders. Which statement about her design is correct?
Correct answer C. There is one independent variable with three levels
Explanation
The number of bystanders is the single factor being manipulated, and its three values (0, 2 and 4) are its levels, while helping behaviour is the dependent variable.
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