Brian Vanecek, VP of Operations at Portland Trust Bank, Is

question 53

Multiple Choice

Brian Vanecek, VP of Operations at Portland Trust Bank, is evaluating the service level provided to walk-in customers.Brian would like to minimize the variance of waiting time for these customers, since this would mean each customer received the same level of service.Accordingly, his staff recorded the waiting times for 15 randomly selected walk-in customers, and determined that their mean waiting time was 15 minutes and that the standard deviation was 4 minutes.Assume that waiting time is normally distributed.The 95% confidence interval for the population variance of waiting times is ________.

• A)9.46 to 34.09
• B)56.25 to 64.87
• C)11.05 to 16.03
• D)8.58 to 39.79
• E)12.50 to 42.35

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Definitions:

Moderate Voice Pitches

Pertains to voice tones that are neither too high nor too low, often considered pleasant and effective for communication.

Visual Cliff

An apparatus used to test depth perception in infants.

Heart Rate

The number of heartbeats per unit of time, usually expressed as beats per minute (BPM), indicating cardiovascular health and physical conditioning.

Vocalizations

The sounds produced by animals or humans which can include speech, singing, or other non-verbal sounds used for communication.