Mathematics, 13.01.2020 03:31, tmantooth7018

which situation is an example of an observational study?

a. placing different groups of people in different colored rooms and recording their mood
b. finding the number of red jellybeans placed in an average jar of jellybeans by counting
c. dividing a class into thirds, giving each third a different amount of time to read, and then testing comprehension
d. having customers fill out a questionnaire about their favorite brand of toothpaste

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which situation is an example of an observational study?

a. placing different groups of...

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