Questions: Determine whether the study depicts an observational study or an experiment. Fifty patients with brain cancer are divided into two groups. One group receives an experimental drug to fight cancer, the other a placebo. After two years, the spread of the cancer is measured. Does the description correspond to an observational study or an experiment? A. The study is an experiment because the researchers control one variable to determine the effect on the response variable. B. The study is an observational study because the study examines individuals in a sample, but does not try to influence the response variable. C. The study is an experiment because the study examines individuals in a sample, but does not try to influence the variable of interest. D. The study is an observational study because the researchers control one variable to determine the effect on the response variable.

Determine whether the study depicts an observational study or an experiment. Fifty patients with brain cancer are divided into two groups. One group receives an experimental drug to fight cancer, the other a placebo. After two years, the spread of the cancer is measured. Does the description correspond to an observational study or an experiment? A. The study is an experiment because the researchers control one variable to determine the effect on the response variable. B. The study is an observational study because the study examines individuals in a sample, but does not try to influence the response variable. C. The study is an experiment because the study examines individuals in a sample, but does not try to influence the variable of interest. D. The study is an observational study because the researchers control one variable to determine the effect on the response variable.
Transcript text: Determine whether the study depicts an observational study or an experiment. Fifty patients with brain cancer are divided into two groups. One group receives an experimental drug to fight cancer, the other a placebo. After two years, the spread of the cancer is measured. Does the description correspond to an observational study or an experiment? A. The study is an experiment because the researchers control one variable to determine the effect on the response variable. B. The study is an observational study because the study examines individuals in a sample, but does not try to influence the response variable. C. The study is an experiment because the study examines individuals in a sample, but does not try to influence the variable of interest. D. The study is an observational study because the researchers control one variable to determine the effect on the response variable.
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Solution

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Solution Steps

Step 1: Identify the Intervention

Based on the description, an active intervention or treatment is applied.

Step 2: Examine the Control of Variables

In this study, researchers are controlling one or more variables to observe their effect on a response variable.

Final Answer:

Considering that there is an active intervention applied by the researchers and they are controlling variables to determine their effect on a response variable, the study is classified as an ^experiment^.

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