At alpha of 10%, a city planner wants to test the hypothesis that public transit users spend less time commuting to work than non-public transit users. She obtained the following sample data. Transit Users Non-Transit Users Mean (min) 20 30 Standard Deviation 5 10 Sample Size 26 26 The critical value is _________________ Question 34 options: a) + 1.28 b) - 1.299 c) + 1.676 d) - 1.28 e) + 1.299