The Variables Height and Weight Could Reasonably Be Expected to Have

question 51

Essay

The variables height and weight could reasonably be expected to have a positive linear correlation coefficient, since taller people tend to be heavier, on average, than shorter people. Give an example of a pair of variables which you would expect to have a negative linear correlation coefficient and explain why. Then give an example of a pair of variables whose linear correlation coefficient is likely to be close to zero.

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Definitions:

Diastole

The phase of the cardiac cycle during which the heart relaxes and fills with blood after contraction.

Electrocardiogram

A test that measures the electrical activity of the heart to show whether or not it is working normally.

P Wave

First complex of the electrocardiogram representing depolarization of the atria.

Atrial Depolarization

The electrical activation of the atria of the heart, leading to atrial contraction and the initiation of the heartbeat.