Question

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.


Math   Statistics-And-Probability   
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Answer #1

The sign of the value of test statistics depends on the statement of hypothesis.

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