The Quality Control Manager at a Cell Phone Battery Factory

question 144

Multiple Choice

The quality control manager at a cell phone battery factory is interested in the mean life of a large shipment of batteries.Battery life is normally distributed with a standard deviation of 100 hours.A random sample of 64 batteries indicates a sample mean of 350 hours.The 99% confidence interval for mean battery life is _____.

• A)[317.8,382.2]
• B)[308.9,391.1]
• C)[311.4,362.5]
• D)[312.5,387.5]
• E)[320.9,379.1]

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Definitions:

Attendance

The act of being present at a particular place or event.

Persons

Refers to individuals or entities that are capable of possessing rights and duties.

Long-Run Equilibrium

A market condition where supply equals demand, all firms are maximizing profit, and no firm has an incentive to change its output.

Club Meeting

An organized gathering of members belonging to a particular club or group to discuss matters of common interest.