A Credit Card Company Operates Two Customer Service Centers: One

question 114

Multiple Choice

A credit card company operates two customer service centers: one in Boise and one in Richmond. Callers to the service centers dial a single number, and a computer program routs callers to the center having the fewest calls waiting. As part of a customer service review program, the credit card center would like to determine whether the average length of a call (not including hold time) is different between the two centers. The managers of the customer service centers are willing to assume that the populations of interest are normally distributed with equal variances. Suppose a random sample of phone calls to the two centers is selected and the following results are reported: Using the sample results, develop a 90% confidence interval estimate for the difference between the two population means.

• A) -29.3124 ≤ (µ1 - µ2) ≤ -18.6876
• B) -24.2412 ≤ (µ1 - µ2) ≤ -17.7588
• C) -26.2941 ≤ (µ1 - µ2) ≤ -11.8059
• D) -28.5709 ≤ (µ1 - µ2) ≤ -13.4291

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Definitions:

Government Surveys

Data collection tools used by governments to collect information about populations, economic indicators, public opinions, or conditions within the country.

Consumer Price Index

A measure that examines the weighted average of prices of a basket of consumer goods and services, such as transportation, food, and medical care, used to monitor inflation.

Consumer Price Index

A benchmark that evaluates the mean change through time in the outlay by urban consumers for a chosen collection of consumer items and services.

Standard of Living

The level of wealth, comfort, material goods, and necessities available to a person or community.