If All the Points in a Scatterplot Lie on the Least

question 31

Multiple Choice

If all the points in a scatterplot lie on the least squares regression line, then what must the correlation coefficient r be?

• A) only 1.0
• B) only -1.0
• C) either 1.0 or -1.0
• D) only 100

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Definitions:

Intradermal

Pertaining to the administration of substances directly into the dermis layer of the skin.

Allergy

An immune system response to a foreign substance that's not typically harmful to the body, like pollen, food, or pet dander.

TB Test

A diagnostic test for tuberculosis (TB) that typically involves injecting a substance called tuberculin into the skin and observing the reaction to determine exposure to TB bacteria.