A group of researchers want to determine if a new supplement is truly effective

Question

A group of researchers want to determine if a new supplement is truly effective in improving energy and alertness. A sample of participants are randomly assigned to either the treatment group which receives this supplement, or the control group which receives a placebo. Measures of health along the lines of increased alertness are carefully identified and measured. Neither the participants, nor the attending researchers or physicians analyzing the results know to which group they belong. How would you classify this study?

Question 1 options:

All of the choices are correct

Randomized Controlled Experiment

Observational Study

Retrospective Study

Prospective Study

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Question 2 (1 point)

A study of cell phones and the risk of brain cancer looked at a group of 500 people who already have brain cancer. The investigators matched each brain cancer patient with a person of the same sex, age, and race of someone who did not have brain cancer. The researchers then asked these individuals about their use of cell phones. What type of study is this?

Question 2 options:

Unable to determine

Randomized Experiment

Prospective Study

Randomized Controlled Experiment

Retrospective Study

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Question 3 (1 point)

Suppose a prospective study is conducted to determine if living in areas of high pollution is linked with lung cancer. Participants are assigned to either a treatment group or a control group. Participants in the two groups are similar except that _______?

Question 3 options:

Participants in the treatment group must live in an area of high air pollution and have lung cancer whereas those in the control group neither live in an area of high air pollution, nor do they have lung cancer.

Participants in treatment group do not have lung cancer whereas those in the control group do.

Participants in treatment group live in areas of high air pollution, whereas those in the control group do not live in areas of high air pollution

Participants in the treatment group have lung cancer whereas those in the control group do not.

Participants in the control group smoke and have lung cancer and live in areas of high air pollution, whereas those in the treatment group neither smoke nor have lung cancer, nor do they live in areas of high air pollution.

All of the choices are correct

Randomized Controlled Experiment

Observational Study

Retrospective Study

Prospective Study

Explanation / Answer

1) Randomized Controlled Experiment

2) Retrospective Study

3)Participants in treatment group live in areas of high air pollution, whereas those in the control group do not live in areas of high air pollution

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