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Question: Which type of study is this? 1.

Which type of study is this?
1. A prospective observational study because it followed the maids for four weeks.
2. A retrospective observational study because at the end of four weeks, the researcher had to look back at the original measurements.
3. A survey because the maids were randomly selected.
4. A designed experiment because a randomly selected group was treated differently and the researcher was interested in the effect of that treatment.
5. A voluntary response study because the maids volunteered to participate.


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