Check whether the given study is a sample or observational study or experimental study. Find the values of population, parameter of interest and sampling procedure, if the study is a sample. Find whether the study is prospective or retrospective, if it is an observational study. If the study is an experimental design, describe the factors, treatments, randomization, response variable and blinding.

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Chapter R, Problem 3.11RE

To determine

Check whether the given study is a sample or observational study or experimental study.

Find the values of population, parameter of interest and sampling procedure, if the study is a sample.

Find whether the study is prospective or retrospective, if it is an observational study.

If the study is an experimental design, describe the factors, treatments, randomization, response variable and blinding.

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