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 null and alternate hypothesis: H0:mu1-mu2=0 vs. Ha:mu1-mu2 not equal 0 Calculate the value of the test statistic
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 null and alternate hypothesis: H0:mu1-mu2=0 vs. Ha:mu1-mu2 not equal 0 Calculate the value of the test statistic
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
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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 |
|
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 null and alternate hypothesis:
H0:mu1-mu2=0 vs. Ha:mu1-mu2 not equal 0
Calculate the value of the test statistic.
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