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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