QUESTION 24 4 points A computer laboratory manager was in charge of purchasing new battery packs for her lab of laptop computers. She narrowed her choices to two models that were available for her machines. Since the models cost about the same, she was interested in determining whether there was a difference in the average time the battery packs would function before needing to be recharged. She took two independent samples and computed the following summary information; Battery Pack Model 1 Battery Pack Model 2 Sample Size Sample Mean 5 houm 5 5 hours Standard Deviation 1:5 hours 1.3 hours Using the null and allemain hypothesis: HO mul-my?=0 vs. Ha mul-mu2 not equal 0 The best statistic is: 0.7557 Using alpha #0,06 choose the appropriate decision? O A. None of these C B. Do not reject HO C. Reject Ha C D. Reject 10A 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 Southam Cal Gas Sample Size 9 412 Sample Moan 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 me approximately normal Using the following null and alternate hypothesis: HO mul:muz-0villa mul mul not equal 0 Test statione la t 1 455 Assume alpha - 0.1 what is the appropriate conclusion for this test? D A. Do not reject HO Oh, none of those C. Repli HO D. Reject Ha