If a Scatter Plot of Variables X and Y Shows

question 100

Multiple Choice

If a scatter plot of variables X and Y shows a trend that can be summarized to a large degree by a straight line with slope 0.8 and y-intercept 0.2 (i.e., Y = 0.2 + 0.8X) , then the correlation coefficient between X and Y is ______.

• A)0.8, and there is a causal relation between X and Y (either X causes Y or Y causes X)
• B)0.2, and there is a causal relation between X and Y (either X causes Y or Y causes X)
• C)0.8, but there is no causal relation between X and Y
• D)0.2, but there is no causal relation between X and Y
• E)0.8, and there may be a causal relation between X and Y, but not necessarily

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Definitions:

Costal Angle

The angle formed by the meeting of the lower borders of the rib cage, usually becoming more acute when the ribs are drawn together during inspiration.

Kyphosis

An excessive outward curvature of the spine, leading to a hunched back appearance.

Barrel Chest

A chest shape characterized by an increased front-to-back diameter and a rounded appearance, often seen in chronic obstructive pulmonary disease (COPD).

Atelectasis

The collapse of part or all of a lung, preventing the respiratory exchange of carbon dioxide and oxygen.