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29 September, 09:41

Which situation is an example of an observational study

A. Having customers fill out a questionnaire about the favorite brand of toothpaste

B. Placing different groups of people in different color rooms and recording their mood

C. Dividing a class into thirds giving each third a different amount of time to read and then testing comprehension

D. Finding the number of red jelly beans placed in the average jar of jelly beans by counting

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  1. 29 September, 09:55
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    Think its D. Finding the number of red jelly beans placed in the average jar of jelly beans by counting
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