Indicate whether the following study is an observational study or a controlled experiment. A researcher is interested in the effect of music on memory. She randomly divides a group of students into two groups: those who will listen to quiet music and those who will listen to loud music. As the students listen to the music, the researcher gives a series of facts. After the appropriate music is played, she gives all the students a recall test for memory. She found that the group listening to quiet music recalled 87% of the facts, while the group listening to loud music was able to recall48% of the facts. Select the correct answer below. A. This is an observational study. The researcher observes only the results of the recall test. The researcher does not decide which person will listen to loud or quiet music. Since the students decide which type of music they want to hear, this is an observational study. B. This is a controlled experiment. She assigns students to the control and treatment groups at random in order to control for all relevant factors aside from the effect of music on memory, which is essential to conducting a controlled experiment. C. This is a controlled experiment. The researcher controls for other factors prior to assigning students to the control group and two treatment groups. This is essential to conducting a controlled experiment.

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Indicate whether the following study is an observational study or a controlled experiment.

A researcher is interested in the effect of music on memory. She randomly divides a group of students into two groups: those who will listen to quiet music and those who will listen to loud music. As the students listen to the music, the researcher gives a series of facts. After the appropriate music is played, she gives all the students a recall test for memory. She found that the group listening to quiet music recalled 87% of the facts, while the group listening to loud music was able to recall48% of the facts.

Select the correct answer below.

This is an observational study. The researcher observes only the results of the recall test. The researcher does not decide which person will listen to loud or quiet music. Since the students decide which type of music they want to hear, this is an observational study.

This is a controlled experiment. She assigns students to the control and treatment groups at random in order to control for all relevant factors aside from the effect of music on memory, which is essential to conducting a controlled experiment.

This is a controlled experiment. The researcher controls for other factors prior to assigning students to the control group and two treatment groups. This is essential to conducting a controlled experiment.

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