A researcher wants to conduct an experiment that uses a 2 X 3 X 3 design and requires ten participants in each cell. ____ participants would be needed for a between-subjects design but only ____ would be needed if a within-subjects design is used.

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For a between-subjects design, the total number of participants needed is calculated by multiplying the levels of each factor (2 x 3 x 3) and then multiplying by the number of participants per cell (10), resulting in 180 participants. For a within-subjects design, each participant can participate in all conditions, so only the number of participants per cell is needed, which is 10.

A Researcher Wants to Conduct an Experiment That Uses a 2