Medicine a is an effective treatment for the common cold a study was conducted to test the effectiveness of medicine a which question would determining whether the conclusion above is valid

B.) How many people were included in the study?

This is the best answer, as the more people there is, a greater variety of choices is possible, leading to a better result that can usually apply to a larger population.

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carla slowed down in the beginning of her trip, stopped, and then sped up

it has to be b, about 97 percent.