A Random Sample of 64 Students at a University Showed

question 30

Multiple Choice

A random sample of 64 students at a university showed an average age of 25 years and a sample standard deviation of 2 years. The 98% confidence interval for the true average age of all students in the university is

• A)20.5 to 26.5
• B)24.4 to 25.6
• C)23.0 to 27.0
• D)20.0 to 30.0

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Definitions:

Constant Speed

Maintaining a uniform speed regardless of load or other external conditions.

Rotating Magnetic Field

A magnetic field that rotates in space within an electrical machine, such as an induction motor, enabling motion of the rotor.

RPM Speed

A measure of the rotational speed of a mechanical component, denoted in revolutions per minute.

Synchronous Speed

The speed at which the magnetic field in an AC motor rotates, directly proportional to the frequency of the electrical supply and the number of poles in the motor.