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

question 234

True/False

In trying to construct 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 model 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 mean amount the repeat students tended to be above or below non-repeaters, with all other factors the same.

Recognize the relationship between the F-distribution and the chi-squared distribution.

Understand the properties and applications of the chi-squared distribution.

Perform hypothesis tests regarding population variances and interpret the results.

Estimate the variance ratio between two populations and interpret confidence intervals for this ratio.

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