Sales from a Chain of Computer Stores Are Normally Distributed

question 32

Multiple Choice

Sales from a chain of computer stores are normally distributed, with an average monthly sales volume of $280,560.Estimating the amount of monthly variability in sales is of interest to help anticipate normal income fluctuations.A random sample of 8 months' sales data yields a standard deviation of $10,423.What is a 98% confidence interval for the standard deviation of monthly sales volume?

• A) ($172,694.71, $666,866.84)
• B) ($6152.47, $21,491.21)
• C) ($6123.96, $27,725.40)
• D) ($6415.73, $24,774.57)

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Definitions:

Viscosity

The sheer resistance of a liquid often used to mean oil thickness or resistance to flow.

Ground Circuit

An electrical circuit that uses the earth as a part of its conductive path, enhancing safety by preventing electric shock.

Insulated Circuit

The positive side of a chassis, negative ground electrical circuit. When testing voltage drop on the insulated circuit of a cranking system, total voltage drop should not exceed 0.5 volt in most 12-volt systems.

Voltage Drop Testing

A diagnostic method to measure the voltage loss in a circuit under load, identifying potential issues within the electrical system.