The Owner of a Local Nightclub Has Recently Surveyed a Random

question 7

Multiple Choice

The owner of a local nightclub has recently surveyed a random sample of n = 250 customers of the club. She would now like to determine whether or not the mean age of her customers is over 30. If so, she plans to alter the entertainment to appeal to an older crowd. If not, no entertainment changes will be made. Suppose she found that the sample mean was 30.45 years and the sample standard deviation was 5 years. If she wants to be 99% confident in her decision, what conclusion can she make?

• A) There is not sufficient evidence that the mean age of her customers is over 30.
• B) There is sufficient evidence that the mean age of her customers is over 30.
• C) There is not sufficient evidence that the mean age of her customers is not over 30.
• D) There is sufficient evidence that the mean age of her customers is not over 30.

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Definitions:

Swashplate Type

A design commonly found in hydraulic pumps and motors, featuring a slanted disk that converts rotational motion into linear motion.

A/C Compressor

A mechanical pump within an air conditioning system, responsible for compressing refrigerant and circulating it through the system.

Servicing A/C Systems

The maintenance and repair processes involved in ensuring the optimal functioning of air conditioning systems, typically involving refrigerant handling, leak detection, and performance checks.

Vacuum Pump

A device that removes gas molecules from a sealed volume to create a partial vacuum, often used in automotive and industrial applications.