Question

A researcher is curious to find out what effect classical music has on people’s level of relaxation (as measured by heart rate). He suspects that listening to classical music will make people feel more calm and relaxed. He lets one group listen to classical music for one hour. He lets another group sit in a quiet room for one hour (i.e they hear no music). After one hour, he monitors the heart rate of each participant to measure their level of relaxation.
What is the Independent variable
the Dependent variable
The control group
the experimental group
The confounding variables
and what is the hypothesis

Answer 1

The independent variable is a variable that represents a quantity being manipulated in an experiment, the control group will be the group that did not hear the music, and the experimental group the group that heard the song.

Independent variable

An independent variable is a variable that represents a quantity being manipulated in an experiment.

xxx is often the variable used to represent the independent variable in an equation.

Dependent variables

A dependent variable represents a quantity whose value depends on how the independent variable is manipulated.

yyy is often the variable used to represent the dependent variable in an equation.

Confounding variable

It is a variable that influences both the dependent variable and the independent variable, causing a spurious association. The confounding variable is a causal concept and as such cannot be described in terms of correlations or associations.

With this information, we can conclude that, The control group are people who have not heard the music, the experimental group are those who heard the music, and the hypothesis is that music can change people's heart rate.

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