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asked Jan 21, 2021 76.9k views

5 votes

[Choose} PLEEASE HELP

Mathematics
high-school

Shenique asked

by Shenique

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2 Answers

5 votes

Answer:

i think the second one

Explanation:

Max Murphy answered Jan 23, 2021

by Max Murphy

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6 votes

Answer:

experimental study

Explanation:

observational study: no variable is controlled by researchers

experimental study: a variable is controlled by researchers

survey: a survey is similar to a poll

Retype answered Jan 27, 2021

by Retype

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