Answer and Explanation:
An ideal randomized controlled experiment to measure the productivity of the factory would be established in the following way: owners of all sectors of the factory would be selected. This selection would be done completely randomly so that it was possible to select individuals different from each other. These employees would be divided into two groups. The first group would receive training, the second group would not receive training.
In this case, the productivity of one group would be compared to the productivity of the other, after both groups were submitted to a period of work, after the first group received training.