A researcher interested Attention Deficit Disorder (ADHD) in adults believes that ADHD is related to accident-proneness. It is known that in the general U.S. population, adults visit the hospital ,4 = 7 times with o- = 2 for causes related to accidents during any twenty-year period. The researcher obtains a random sample of 15 adults with ADHD who allow the researcher to review their medical records from the last 20 years. The data below represent the number of accident-related hospital visits each adult with ADHD made over the last twenty years: 8, 10, 8, 9, 11, 5, 8, 11, 8, 7, 10, 9, 7, 8, 8 A. What is z-obtained for this sample? : Tries 1/10 W B. What is the appropriate conclusion assuming that a = .05? (Please choose ALL answers necessary to draw a complete conclusion) l bi