Content B https://learn-us-east-1-prod-fleet02-xythos.content.black. STAT 2470 Paper Homework 10 Cortisol is a hormone that plays an important role in mediating stress. There is a growing awareness that exposure of outdoor workers to pollutants may impact cortisol levels. The article "Plasma Cortisol Concentration and Lifestyle in a Population of Outdoor Workers" (International Journal of Environmental Health Res., 2011: 62-71) reported on a study involving three groups of police officers: 1. Traffic Police (TP) 2. Drivers (D) 3. Other Duties (O) Here is summary data on cortisol concentration (ng/ml) for a subset of the officers who neither frank nor smoked. Group Sample Size Mean SD TP 44 174.7 50.9 D 44 160.2 37.2 0 44 153.5 45.9 Assuming that the standard assumptions for one-way ANOVA are satisfied, carry out a test at significance level 0.05 to decide whether the true average cortisol concentration is different for the three groups. If any differences exist, state which groups are different. Please be sure to show your work!