(c) Suppose, instead of surveying individuals regarding their tea-drinking habits, you decide to conduct a designed experiment. You identify 90 volunteers to participate in the study and designate three levels of the treatment: two cups of a placebo daily, one cup of a placebo and one cup of green tea daily, or two cups of green tea daily. The experiment is to run for one year. The response variable will be the change in LDL cholesterol for each subject from the beginning of the study to the end. What type of experimental design is this?

A. Completely randomized design
B. Matched-pairs design
C. Case-control design
D. Cohort design
E. Cross-section design

(d) Explain how you would use blinding in this experiment.

A. Do not allow the researcher(s) giving the treatments to know which level of the treatment they are giving. This is a single-blind study.
B. Do not allow the subjects to know which level of the treatment they are receiving. Also, do not allow the researcher(s) giving the treatments to know which level of the treatment they are giving. This is a double-blind study.
C. Split up both the males and females equally into the three different treatment groups.
D. Do not allow the subjects to know which level of the treatment they are receiving. This is a double-blind study.
E. Blinding is not possible in this experiment.

The experimental design described in the question is a completely randomized design. In this type of design, subjects are randomly assigned to different treatment groups to eliminate bias and ensure the validity of the results.

Blinding in the Experiment:

To implement blinding in this experiment, the appropriate approach would be to conduct a double-blind study. This involves ensuring that both the subjects and the researchers giving the treatments are unaware of which treatment each subject is receiving to reduce bias.

Control Group and Placebo:

In this study, the control group receives a placebo treatment to serve as a comparison against the groups receiving different levels of green tea, helping researchers assess the true effects of green tea consumption on LDL cholesterol levels.

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