A Sample of 25 Observations Is Taken to Estimate a Population

question 35

Multiple Choice

A sample of 25 observations is taken to estimate a population proportion π. The sampling distribution of sample proportion p is:

• A) not normal since n < 30.
• B) approximately normal because is always normally distributed.
• C) approximately normal if np ≥ 5 and n(1 - p) ≥ 5.
• D) approximately normal if p approaches 0.50.

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Definitions:

Depolarization

The loss of polarity, or opposite charges inside and outside; the electrical impulse that initiates a chain reaction resulting in contraction.

Electrical Impulse

A rapid, transient electrical charge that travels along the membrane of a nerve or muscle cell.

Chain Reaction

A sequence of reactions where a reactive product or by-product causes additional reactions to take place.

P-R Interval

A measurement on an electrocardiogram (ECG) reflecting the time between the onset of atrial depolarization and the onset of ventricular depolarization; important in diagnosing cardiac conditions.