# A customer service representat

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 representat

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

# A customer service representat

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

The test statistic was computed to be -1.455

Assuming alpha = 0.10, set up the appropriate rejection region for the hypothesis test.

 A. Reject H0 if |t| > t(alpha =0.05, df=19) B. Reject H0 if |t| > t(alpha =0.05, df=20) C. Reject H0 if |t| > t(alpha =0.1, df=20) D. Reject H0 if |t| > t(alpha =0.1, df=19)

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