A Least Squares Estimated Regression Line Has Been Fitted to a Set

question 33

Multiple Choice

A least squares estimated regression line has been fitted to a set of data and the resulting residual plot is shown. Which is true?

• A) The linear model seems appropriate.
• B) The linear model is poor because some residuals are large.
• C) The linear model is poor because there is a pattern.
• D) The plot shows a bend, thus a curved model would be more appropriate.
• E) There is one extreme outlier, a transformation of the data is recommended.

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Definitions:

Independent Variable

The factor in a study that is deliberately changed by the investigator to see how it influences the outcome variable.

Statistically Significant Interaction

An interaction between variables that leads to a difference in outcomes which is unlikely to be due to chance alone, according to statistical analysis.

Means

Statistical averages that are calculated by adding up all the numbers in a set and then dividing by the count of those numbers.

Authorship

The credit given to individuals for their contribution to the creation of a work, such as a book, article, or study.