The Difference Between Before-After and Controlled Before-After Experimental Design Is

question 61

Multiple Choice

The difference between before-after and controlled before-after experimental design is that:

• A) the controlled before-after design is meant specifically for primary research.
• B) the before-after design is meant specifically for primary research.
• C) the controlled before-after design involves not one group, but two.
• D) the first step involved in the controlled before-after design is the selection of an experimental group.
• E) the before-after design measures the variables to be tested before the experiment begins.

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Definitions:

68-95-99.7 Rule

A statistical rule stating that for a normal distribution, approximately 68% of the data falls within one standard deviation of the mean, 95% within two standard deviations, and 99.7% within three standard deviations.

Observed Responses

Observed responses refer to the actual outcomes or reactions recorded in an experiment or survey, following exposure to certain conditions or stimuli.

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.