In 1990, the Average Duration of Long-Distance Telephone Calls Originating $\mathrm { H } _ { 0 } : \mu \neq 8.5$

question 8

Multiple Choice

In 1990, the average duration of long-distance telephone calls originating in one town was 8.5 minutes. A long-distance telephone company wants to perform a hypothesis test to determine whether the average duration of long-distance phone calls has changed from the 1990 mean of 8.5 minutes.

• A) \(\mathrm { H } _ { 0 } : \mu \neq 8.5\) minutes
• \(\mathrm { H } _ { \mathrm { a } } : \mu = 8.5\) minutes
• B) \(\mathrm { H } _ { 0 } : \mu = 8.5\) minutes
• \(\mathrm { H } _ { \mathrm { a } } : \mu > 8.5\) minutes
• C) \(\mathrm { H } _ { 0 } : \mu = 8.5\) minutes
• \(\mathrm { H } _ { \mathrm { a } } : \mu \neq 8.5\) minutes
• D) \(\mathrm { H } _ { 0 } : \mu = 8.5\) minutes
• \(\mathrm { H } _ { \mathrm { a } } : \mu < 8.5\) minutes

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Definitions:

Freshwater

refers to water with minimal salt content, crucial for drinking, agriculture, sanitation, and ecosystem support.

Human Use

The application or utilization of resources, products, or services to satisfy human needs or wants.

Global Basis

A perspective or action at the worldwide level, considering global impact rather than local or national alone.

Least Amount

The minimal quantity or degree of something required or present.