Plainfield Telemarketing Plans to Estimate the Average Number of Telephone

question 66

Multiple Choice

Plainfield Telemarketing plans to estimate the average number of telephone contacts made by its 245 sales reps over the past month.A sample of reps will be randomly selected for the estimate.To construct a 99% confidence interval estimate in which the margin of error will be no more than 20 contacts, how many reps should be included in the sample? Assume a similar study showed a standard deviation of 120 contacts.

• A)268
• B)145
• C)169
• D)121
• E)240

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Definitions:

Problem Solver

An individual or tool that determines and implements a solution to a complex issue or challenge through analysis and creative thinking.

Telegraphic Speech

A form of communication often used by young children that includes only the most essential words to convey a message.

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Pythagorean Theorem

A fundamental principle in geometry that states the square of the hypotenuse in a right-angled triangle is equal to the sum of the squares on the other two sides.