A researcher designs a 2 * 2 * 2 complex design in which the first independent variable uses a random groups design,the second independent variable uses a natural groups design,and the third independent variable uses a repeated measures design.The researcher wants to have 20 participants in each independent groups condition.How many participants will she need to recruit?
A) 20
B) 40
C) 80
D) 160

Question

Quizplus · Accepted Answer

The number of participants needed for each independent groups condition in the first independent variable is 20, so a total of 2 groups are required for this variable, which means 40 participants are needed.

For the second independent variable, a natural groups design is used, which means the researcher will use pre-existing groups that are not manipulated. Therefore, no additional participants are needed for this variable.

Finally, for the third independent variable, a repeated measures design is used, which means each participant will be measured multiple times. The total number of groups required for this variable is also 2. Therefore, the total number of participants required for this study is:
(40 participants per group) * (2 groups per independent variable) * (2 independent variables) = 160 participants.

A Researcher Designs a 2 * 2 * 2 Complex