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marusya05 [52]
3 years ago
11

Please help!!! WILL MARK BRAINLIEST ANSWER!!! A medical researcher designs a study that will investigate the effects of a

Mathematics
2 answers:
Hoochie [10]3 years ago
5 0

 b. more groups should have been

lorasvet [3.4K]3 years ago
4 0

Answer:

C AND D

Step-by-step explanation:

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