tessanicholson tessanicholson

01-10-2020
Mathematics

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milohakala milohakala

01-10-2020

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

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Dyan153 Dyan153

02-10-2020

Answer:

i think the second one

Step-by-step explanation:

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