Dr. cooke wanted to know if a drug was more effective than a placebo. she gave one group the real drug and measured its effectiveness, and gave the other group the placebo and measured its effectiveness. dr. cooke is doing a(n):

By the 1820s, many americans wanted to have an equal number of senators from the free states and the slave states. to achieve that, what would need to be true? sorry, the correct answer is: explanation review you answered: questions answered 11 time elapsed 00 17 08 hr min sec challenge stage 2 of 3 get 5 of 6 correct