Show transcribed image text Section 9.3 Many freeways have service signs which give information on attractions, camping, lodging, food and gas services prior to off-ramps. These signs may or may not include information on distances to the services. In a study, 6 highway locations with service signs posted were selected. For each site, crash data was obtained for a 3-year period before distance information was added to the sign. Crash information was also obtained for the 1-year period after distances were added. The data for before and after the sign changes (in crashes per year) is Site 1 Before 15 26 6611564 64 23 45 6 fter 1624 80 79 73 Assume all populations being sampled from are normally distributed. Use a paired test with α 05 to determine whether the average number of crashes near service signs changes after the addition of distance information
Section 9.3 Many freeways have service signs which give information on attractions, camping, lodging, food and gas services prior to off-ramps. These signs may or may not include information on distances to the services. In a study, 6 highway locations with service signs posted were selected. For each site, crash data was obtained for a 3-year period before distance information was added to the sign. Crash information was also obtained for the 1-year period after distances were added. The data for before and after the sign changes (in crashes per year) is Site 1 Before 15 26 6611564 64 23 45 6 fter 1624 80 79 73 Assume all populations being sampled from are normally distributed. Use a paired test with α 05 to determine whether the average number of crashes near service signs changes after the addition of distance information
