4. Application: a. An experiment was conducted to compare the mean reaction times of two types of traffic signs: prohibitive (No Left Turn) and permissive (Left Turn Only). Ten drivers were included...

Extracted text: 4. Application: a. An experiment was conducted to compare the mean reaction times of two types of traffic signs: prohibitive (No Left Turn) and permissive (Left Turn Only). Ten drivers were included in the experiment. Each driver was presented with 40 traffic signs, 20 prohibitive and 20 permissive, in random order. The mean time to reaction and the number of correct actions were recorded for each driver. The mean reaction times (in milliseconds) to the 20 prohibitive and 20 permissive traffic signs are shown here for each of the 10 drivers: Driver Prohibitive Permissive 1 824 702 2 866 725 841 744 4 770 663 829 792 6. 764 708 7 857 747 831 846 685 9. 742 10 759 610 Do the data present sufficient evidence to indicate a difference in mean reaction times to prohibitive and permissive traffic signs? Test using a = 0.01.