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

question 31

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 is appropriate.
• B) The linear model is poor because some residuals are large.
• C) The linear model is poor because the correlation is near 0.
• D) A curved model would be better.
• E) A transformation of the data is required.

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Definitions:

Eutherian Mammal

Mammals that are characterized by a complex placenta that allows a long gestation period within the uterus, leading to the birth of relatively well-developed offspring.

Insectivora

An obsolete term for an order of mammals, now split into various orders, that are characterized by feeding on insects and other small invertebrates.

Closed Circulatory System

A circulatory system where blood is contained within vessels and is separated from bodily tissues, as seen in vertebrates.

Dorsal Heart

A dorsal heart is a heart that is located towards the back (dorsal) side of an organism, contrasting with the ventral placement seen in humans.