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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 routes 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 for 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: Boise n₁ = 120 $₁ = 35.10 x₁ = 195 Richmond n₂=135 $₂ = 37.80 x₂ = 216 Using the sample results, develop a 90% confidence interval estimate for the difference between the two population means.

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 routes 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 for 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: Boise n₁ = 120 $₁ = 35.10 x₁ = 195 Richmond n₂=135 $₂ = 37.80 x₂ = 216 Using the sample results, develop a 90% confidence interval estimate for the difference between the two population means.

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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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 routes 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 for 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: Boise ni = 120 S₁ = 35.10 x₁ = 195 Richmond n₂ = 135 $₂ = 37.80 x₂ = 216 Using the sample results, develop a 90% confidence interval estimate for the difference between the two population means.
Transcribed Image Text: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 routes 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 for 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: Boise ni = 120 S₁ = 35.10 x₁ = 195 Richmond n₂ = 135 $₂ = 37.80 x₂ = 216 Using the sample results, develop a 90% confidence interval estimate for the difference between the two population means.
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