An Electronics Retailer Believes That,at Most,40% of Their Cell Phone

question 36

Multiple Choice

An electronics retailer believes that,at most,40% of their cell phone inventory was sold during November. The retailer surveyed 80 dealers and found that 38% of the inventory was sold. Since 38% is less than 40%,is this difference of 2 percentage points sampling error or a significant difference? Test at the 0.05 level. The computed z = −0.37.

• A)The 2% is a significant difference.
• B)We cannot determine if the 2% is a significant difference.
• C)There is not enough information to reach a conclusion.
• D)None of the other answers apply.

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Definitions:

Ventricular Excitation

The process of electrical activation of the ventricles of the heart, leading to their contraction.

ECG

A test that records the electrical activity of the heart to detect heart conditions.

ECGs

Electrocardiograms, a medical test that measures the electrical activity of the heart to identify abnormalities.

Atrioventricular Valves

Heart valves located between the atria and ventricles, enabling blood flow from the atria to the ventricles while preventing backflow.