Answer Happy

2. Reaction times in milliseconds) for 11 individuals to prohibitive traffic signs (e.g., No Left Turn) and permissive traffic signs (e.g., Left Turn Only) are given below. This experiment was a matched pairs design where each individual was presented the signs in random order. Individual Prohibitive Permissive 1 2 3 4 5 6 7 8 9 10 11 824 862 841 770 828 764 857 831 781 795 815 715 725 744 775 792 722 806 794 738 782 776 Test whether there is evidence that the true mean reaction time for individuals responding to prohibitive traffic signs exceeds the true mean reaction time for individuals responding to permissive traffic signs at a = 0.01. 3. Rental cars can be reserved by telephone or online. Independent random samples of 106 rental car customers who called by phone and 80 customers who went online were selected. Of those who used the phone, 85 were satisfied with the reservation process; of those who went online, 62 were satisfied with the reservation process. a. Give a 99% confidence interval for the difference of the two true proportions (true proportion of customers who reserved a rental car by phone who were satisfied minus that for those who went online to reserve a car). b. Test using a = 0.01 to see if there is evidence that those who reserved a rental car by phone are more likely to be satisfied than those who went online.