Researchers wanted to determine if there was an association between the level of trauma of an individual and their risk of breast cancer. The researchers studied 1761 people over the course of 5 years. During this 5-year period, they interviewed the individuals and asked questions about their daily lives and the hassles they face. In addition, hypothetical scenarios were presented to determine how each individual would handle the situation. These interviews were videotaped and studied to assess the emotions of the individuals. The researchers also determined which individuals in the study experienced any type of breast cancer over the 5-year period. After their analysis, the researchers concluded that the trauma-free individuals were less likely to experience breast cancer. Complete parts (a) through (c). (a) What type of observational study was this? Explain. This was a cohort study, because information was collected about a group of individuals by observing them over a long period of time. (b) What is the response variable? What is the explanatory variable? The response variable is level of trauma, because it is the variable of interest