A Psychologist Is Interested Looking at the Effectiveness of a New

question 124

Multiple Choice

A psychologist is interested looking at the effectiveness of a new computer program in helping students learn math. She decides to test this new program with a group of middle school students. At this particular school, the boys and girls tend to be disruptive when they are in the same classroom, so she decides to run them in separate groups in the
Experiment. She creates a group of boys, each of them using the computer program four times per week. She creates a group of girls to serve as a comparison group and they do not get the computer program. This experimental design is flawed because gender is a
Confounding variable and as a result the following has been lowered:

• A) internal reliability
• B) external reliability
• C) internal validity
• D) external validity

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Definitions:

Linear Regression

A statistical method for modeling the relationship between a dependent variable and one or more independent variables by fitting a linear equation.

Standard Deviation

A measure of the dispersion or spread of a set of data points relative to their mean, showing how much variation exists.

Response Variable

The outcome variable that researchers aim to predict or explain through statistical models, observed in an experiment or study.

Standard Error

A statistical measure that describes the accuracy with which a sample mean estimates the population mean.