Please help!!! WILL MARK BRAINLIEST ANSWER!!! A medical researcher designs a study that will investigate the effects of a
new drug on lowering patient's cholesterol level. The researcher randomly
selects participants for two groups. One group is given the new drug and the other group is given a placebo. Any person, within driving distance of the hospital, is allowed to participate and will be given a monetary compensation. Each sample consists of 5 patients. Select all weaknesses in the design.

Please help WILL MARK BRAINLIEST ANSWER A medical researcher designs a study that will investigate the effects of a new drug on lowering patients cholesterol le class=

Respuesta :

 b. more groups should have been

Answer:

C AND D

Step-by-step explanation:

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