A customer service representative was interested in comparing the average time (in minutes) customers are placed on hold when calling Southern California Edison and Southern California Gas companies. The representative obtained two independent random samples and calculated the following summary information: So Cal Edison Southern Cal EdisonSouthern Cal GasSample Size912Sample Mean3.2 min2.8 minSample Standard deviation0.5 min0.7 min Assume the distributions of time a customer is on hold are approximately normal.Using the following null and alternate hypothesis:H0:mu1-mu2=0 vs. Ha:mu1-mu2 not equal 0Test statistic is t=-1.455Assume alpha = 0.1 what is the appropriate conclusion for this test? A.Reject Ha B.Reject H0 C.Do not reject H0 D.none of these

Name: A customer service representative was interested in comparing the aver
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Description: A customer service representative was interested in comparing the average time (in minutes) customers are placed on hold when calling Southern California Edison and Southern California Gas companies. The representative obtained two independent random

Answered: A customer service representative was…

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 customer service representative was interested in comparing the average time (in minutes) customers are placed on hold when calling Southern California Edison and Southern California Gas companies. The representative obtained two independent random samples and calculated the following summary information: So Cal Edison

	Southern Cal Edison	Southern Cal Gas
Sample Size	9	12
Sample Mean	3.2 min	2.8 min
Sample Standard deviation	0.5 min	0.7 min

Assume the distributions of time a customer is on hold are approximately normal.

Using the following null and alternate hypothesis:
H0:mu1-mu2=0 vs. Ha:mu1-mu2 not equal 0
Test statistic is t=-1.455
Assume alpha = 0.1 what is the appropriate conclusion for this test?

	A.	Reject Ha
	B.	Reject H0
	C.	Do not reject H0
	D.	none of these

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