Exhibit 8-2 The Manager of a Grocery Store Has Taken a Random

question 15

Multiple Choice

Exhibit 8-2
The manager of a grocery store has taken a random sample of 100 customers. The average length of time it took these 100 customers to check out was 3.0 minutes. It is known that the standard deviation of the checkout time is one minute.
-Refer to Exhibit 8-2. The standard error of the mean equals

• A)0.001
• B)0.010
• C)0.100
• D)1.000

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Definitions:

Light Beam

A stream of light particles (photons) traveling in the same direction, used in various applications including communication and measurement.

Sensor

A device that detects or measures a physical property (such as temperature, light, pressure) and records, indicates, or otherwise responds to it.

Photoelectric Sensors

Devices that detect objects, changes in light intensity, or proximity by emitting and receiving light.