An Investigator Conducts a Statistical Test to Determine Whether the Difference

question 210

Multiple Choice

An investigator conducts a statistical test to determine whether the difference between the experimental group and the control group was statistically significant. Other things being equal, the difference is most likely to be significant if

• A) the standard deviation was high for each group.
• B) the mean of one group was much larger than the mean of the other group.
• C) both groups had a small number of participants.
• D) the mean for each group was about the same size as the standard deviation.

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Definitions:

Dependent Variable

The variable being tested and measured in an experiment, its outcome depends on the influence of the independent variable.

Factorial Research Design

Research design consisting of all possible combinations of two or more independent variables.

Marginal Mean

The arithmetic mean of values for a particular variable, considering the impact of covariates in the analysis.

Marginal Mean

The average value of a variable across levels of another variable, often used in the context of multivariate data analysis.