In Trying to Obtain a Model to Estimate Grades on a Statistics

question 226

True/False

In trying to obtain a model to estimate grades on a statistics test, a professor wanted to include, among other factors, whether the person had taken the course previously. To do this, the professor included a dummy variable in her regression that was equal to 1 if the person had previously taken the course, and 0 otherwise. The interpretation of the coefficient associated with this dummy variable would be the average amount the repeat students tended to be above or below
non-repeaters, with all other factors the same.

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Definitions:

Df

Short for Degrees of Freedom, it represents the number of independent pieces of information available to estimate another piece of information.

F-Ratio

A statistical value used to compare variances in analyses of variance (ANOVA), indicating the ratio of systematic variance to error variance.

Factor B

Factor B usually represents a variable or an element in an experiment that is manipulated to observe its effect on an outcome, distinguishable from Factor A.

MSB

Mean Square Between; a term used in ANOVA to describe the average of squared differences between group means and the overall mean.