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Chapter 16: One-Way Analysis of Variance
designed to see how the classifications affect the number of credit hours in
which the students were enrolled.
Suppose a researcher is interested in determining the effectiveness of four
teaching methods for a given course. In such an experiment, the researcher
would be interested in the final averages for each student in the course for
the different methods of teaching. Here we refer to the students as the
experimental units
.
Definition: Experimental Units
Individuals or objects on which the experiment is performed are called
experimental units.
The final averages in the above discussion will be the values for the
response variable
.
Definition: Response Variable
A response variable in an experiment is a characteristic of an experimental
unit on which information is to be obtained.
Note:
The response variable may be qualitative, such as whether or not you
pass a course, or quantitative, such as your final overall percentage for the
course.
The experimental variables which we can control or manipulate in ANOVA
are called the independent variables or
factors
.
Definition: Factor
Experimental variables which can be controlled or manipulated are called
the independent variables or factors.
Values of a factor are called the
treatments
or
levels
of the factor.