ack for Number 4. 4.) An article published in the Archives of Pediatrics and Adolescent Medicine described a statistical study in which researchers looked at a random sample of 500 publicly accessible MySpace web profiles posted by 18-year-olds. The content of each profile was analyzed. One of the report's conclusions was that displaying sport or hobby involvement was associate with decreased references to risky behavior. a) Is this an observational study or an experiment? Explain. b) Is it reasonable to generalize the stated conclusion to all 18-year-olds with a publicly accessible MySpace web profile? What aspects of the study supports your answer? c) Not all MySpace users have a publicly accessible profile. Is it reasonable to generalize the stated conclusion to all 18-year-old MySpace users? Why or why not