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Degger [83]
3 years ago
9

I need help please answer if you know the answer

Mathematics
1 answer:
Elena L [17]3 years ago
6 0
In an observational study, only one group is studied, and in an expirement, two groups are studied.
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Hey! i’ll give brainliest please help
myrzilka [38]

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The 4th answer

Step-by-step explanation:

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