The Manager of a Local Specialty Store Is Concerned with a Possible

question 24

Multiple Choice

The manager of a local specialty store is concerned with a possible slowdown in payments by her customers.She measures the rate of payment in terms of the average number of days receivables are outstanding.Generally,the store has maintained an average of 50 days with a standard deviation of 10 days.A random sample of 25 accounts gives an average of 54 days outstanding with a standard deviation of 8 days.What is the critical value for $\alpha$ = .01 to test the hypotheses.

• A)2.485
• B)2.797
• C)2.492
• D)2.787
• E)2.327

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Definitions:

Mobile Phase

In chromatography, the solvent that carries the sample through the stationary phase, allowing components to be separated.

Thin Layer Chromatography

An analytical technique used to separate and identify compounds in a mixture by distributing them between a stationary phase and a mobile phase.

Solid Coating

A layer of solid material applied to a surface for protection, decoration, or functional purposes.

Liquid

A state of matter that is fluid, conforms to the shape of its container, and retains a (nearly) constant volume independent of pressure.