Control vs. observational Indicate whether the study described is an observation

Question

Control vs. observational Indicate whether the study described is an observational study or a controlled experiment. A group of students is divided into two groups. One group listens to classical music while taking a math test and the other group takes the test in silence. The average test scores of the two groups are compared to see whether listening to music during a math test has an effect on scores. controlled experiment observational study The obesity rates of elementary age children living in urban areas are compared to those living in rural areas to see whether children in urban settings have higher obesity rates. controlled experiment observational study A group of students is divided into two groups. One group is given a new chewable vitamin and the other group is given a placebo. After six months they are asked to fill out a questionnaire and given a health exam to see whether the new vitamin has health benefits that are better than a placebo. controlled exp

Explanation / Answer

28) controlled experiment.

Here there are two groups of students being studied for an effect of music on the math test score.

29) observatory study

Here there is no experiment being conducted only the two means/propotions (statistics) are compared for two popualtions/samples.

30) Controlled Experiment

As here two effect of new medicine is being studied.

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