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A sample of college students is selected to participate in an experiment, and each student is...

A sample of college students is selected to participate in an experiment, and each student is
randomly assigned to eat either a high protein breakfast bar or a low protein breakfast bar.
The students are then asked to rate their level of energy just before lunch time. In this study,
we’d consider the _____________________________ to be the explanatory variable and
the ________________________ to be the response variable.
A. energy level; breakfast bar
B. breakfast bar; energy level
C. sample of college students; energy level
D. breakfast bar; meal eaten for lunch
E. sample of college students; breakfast bar

Math   Statistics-And-Probability   
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Answer #1

B. breakfast bar; energy level

An explanatory variable is the one that is controlled by the researcher and is considered as the possible explanation for the variation in the response variable. A response variable is the one over which the researcher does not have any control and it is the one about which the researcher wants to study.

Here, the researcher wants to know how energy levels will change with respect to different breakfast bars. The researcher decides what breakfast bar to be given to the students. Therefore, the explanatory variable is breakfast bar and response variable is energy level.

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