A researcher studying the effects of several control variables is faced with the problem of increasing sample size and increasing cost.The usual solution is the before-after "try-it-out" design.

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The before-after "try-it-out" design does not address the problem of increasing sample size and cost. Instead, it is a type of experimental design where a treatment or intervention is applied to a group and their outcomes are compared to their own pre-treatment baseline measurements.

A Researcher Studying the Effects of Several Control Variables Is