* ) Grades for Vilour * | Learning Persons * Learning Persona X C * adaptive mileyplus.com/secure/adaptivelearningDashboard;jsessionid=/29/GAC5830A519DF456ECO21620A1347chld-MItyNicIM WileyPLUS Adaptive Practice Statistics: Unlocking the Power of D... Practice - 1.3.0: Demonstrate an understanding of experimen Q 148: About 80% of children that use computers wear glasses, so it is believed that computers influence children's vision Explain why it is difficult to get objective verification of this possible causal relationship. An experiment is required in order to verify a cause and effect relationship, but not all children that use computers wear glasses. The answer will be distorted B An experiment is required in order to verify a cause and effect relationship, but not only the use of the computer influences children's vision (there are other factors like food, sports, heredity) C An experiment is required in order to verify a cause and effect relationship, but it would not be appropriate to randomly assign some of the kids to use the computer for long periods of time. D An experiment is required in order to verify a cause and effect relationship. The use of a computer does not always affect the children's vision, so this is not necessarily a causal relationship. Stu ) Mark for Review Confidence 0 9 9 SUBMIT