Question: Which type of study is this? a) A prospective observational study because it followed the maids for four weeks. b) A retrospective observational study because

Which type of study is this?
a) A prospective observational study because it followed the maids for four weeks.
b) A retrospective observational study because at the end of four weeks, the researcher had to look back at the original measurements.
c) A survey because the maids were randomly selected.

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