Researchers are testing the effects of a new weight loss method. Subjects will be randomly assigned to groups. One group will follow the new method and the other group will not. All subjects will be randomized a second time to watch a nutritional information video and the other group will receive a motivational speech. This will result in four different groups as follows:Weight Loss Method + Motivational SpeechWeight Loss Method + Informational VideoNo Weight Loss Method + Motivational SpeechNo Weight Loss Method + Informational VideoWhat type of design is this?

- Factorial

Explanation:

'Factorial design' is characterized as the research pattern in which all combinations of multiple parameters or independent variables are examined.

The given details match the above description of testing two factors across various levels('Weight loss method + Motivational speech,' 'Weight loss Method + Informational Video,' etc.). Thus, it exemplifies a 'factorial design' as it primarily aims to test the distinct effects of a variable/factor on different levels and also the outcomes produced by communication of two independent variables. This assists in determining a valid conclusion that can be relied upon.

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