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I neeeeeddd helppppppp

I neeeeeddd helppppppp-example-1
User York
by
5.0k points

1 Answer

9 votes

Answer:

It's D

Step-by-step explanation:

A: Is wrong due to the fact that longer time spans give more credibility

B: Multiple group testing is needed

C: C makes it better because multiple groups would create more diversity than just 2 groups, but this is unnecesary

D: We need a control group

User Ta Sas
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4.7k points