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One of the major learning objectives of this chapter is to define a factorial research design, including the terms factor andAnother learning objective for this chapter is to understand the concept of an interaction between factors. If two variables

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Smoking history and presentation of images are variables that are being manipulated or non-manipulated.

Presentation of images because we have control over them and that can be changed.

Smoking history because we cannot manipulate it as it is in the past.

Yes

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