An example of a randomized controlled experiment is when A)households receive a tax rebate in one year but not the other. B)one U.S. state increases minimum wages and an adjacent state does not, and employment differences are observed. C)random variables are controlled for by holding constant other factors. D)some 5^th graders in a specific elementary school are allowed to use computers at school while others are not, and their end-of-year performance is compared holding constant other factors.

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This is an example of a randomized controlled experiment because the use of computers is randomly assigned to some 5th graders while others are not, and their performance is compared. Other factors are held constant, and the random assignment helps to eliminate selection biases.

An Example of a Randomized Controlled Experiment Is When