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D Question 13 2.5 pts as A bookstore is testing two shipping firms to determine which company should deliver its packages. The company wants to test if the average time for Shipping Firm 1 is slower than the average shipping time for Shipping Firm 2. Packages were shipped to 36 locations using each of the companies. The results are as follows: Shipping Firm 1: mean delivery time = 13 hours, s = 2.6 hours, n = 36 Shipping Firm 2: mean delivery time = 14 hours, s = 3.1 hours, n = 36 Difference (Shipping Firm 1 time - Shipping Firm 2 time): mean = -1 hours, s = 2.9 hours, n = 36 The correct t-value for this question is: O 2.07 O -5.55 5.55 O -2.07