A researcher is testing a new drug for a condition that has no existing effective treatments. A sample of people with the condition is recruited and randomly divided into two groups – treatment (which receives the new drug) and control (which receives a placebo). The placebo looks exactly like the real drug but it does not contain the active ingredients, and the participants do not know which they are receiving. To ensure this study is ethical, what needs to be included in the research procedures?

Black death spread because of what problem in medieval europe? which one is it i need the answer quick . a- overcrowded cities b-too many farm animals c-not enough qualified doctors d-all of the above

Much of the ill will between armenians and the azeri people of azerbaijan arises because

What was piaget's explanation as to why preschool-age children in the preoperational stage make errors on tasks requiring conservation? a) preschool children's tendency toward centration prevents them from focusing on other relevant features of a situation b) preschool children have not yet developed numerical understanding; therefore, different amounts are meaningless c) preschool children's neural-visual network is not fully matured d) preschool children have not lived long enough and accrued enough experience to know the difference between quantities