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babymother [125]
3 years ago
14

[Choose} PLEEASE HELP

Mathematics
2 answers:
matrenka [14]3 years ago
4 0

Answer:

experimental study

Step-by-step 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

Mumz [18]3 years ago
4 0

Answer:

i think the second one

Step-by-step explanation:

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