Most Efficient Design- stem The Most Efficient Design would most likely be employed when researchers wish to compare the effects of:

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The Most Efficient Design is a factorial design. In a factorial design, the independent variables are crossed, meaning that each level of one IV is combined with each level of the other IV. In this question, the two independent variables being compared are age and cohort. Therefore, the most efficient design would be a 2x2 design with age (young vs. old) and cohort (new vs. old). The other options do not involve two independent variables being crossed, so they would not be appropriate for a factorial design.

Most Efficient Design- Stem the Most Efficient Design Would Most