A study is conducted to investigate whether people who live in areas with legalized gambling tend to have stressful lifestyles. Random samples of anonymous medical records are collected from regions with legalized gambling and regions without, and a determination is made based on survey responses and blood pressure whether each individual could be classified as having a stressful lifestyle. A 95% confidence interval for the difference in proportions classified as stressful (gambling - no gambling) is (0.12, 0.18). Based on the methodology of the study, can we conclude that living in a region with legalized gambling causes the difference we see in stressful lifestyle prevalence? Choose the only fully correct answer. O Yes, because the sample was randomly selected. O Yes, because the explanatory variable was randomly assigned. O No, because the explanatory variable was not randomly assigned. O No, because the sample was not randomly selected