Under What Circumstances Is the Point-Biserial Correlation Used

question 48

Multiple Choice

Under what circumstances is the point-biserial correlation used?

• A)in the same circumstances when a repeated-measures t test would be used
• B)in the same circumstances when an independent-measures t test would be used
• C)when both X and Y are dichotomous variables
• D)when both X and Y are measured on an ordinal scale (ranks)

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Definitions:

SA Node

The sinoatrial node, a group of cells located in the right atrium of the heart that generates electrical impulses initiating each heartbeat.

SA Node

The sinoatrial node, often called the heart's natural pacemaker, initiates electrical impulses that set the rate and rhythm of heartbeats.

Ventricular Contractions

The tightening of the heart's ventricles, which pumps blood out of the heart and into the arteries.

P-QRS Waves

Represents the electrical activity that triggers the heartbeat, as recorded by an electrocardiogram.