(a) Is the study described an observational study or an experiment? O an observational study O an experiment (b) The article says that data from a sample of 2,707 parents were used in the study. What other information at O We need to know if the sample was a random sample. We need to know if the entire population was included in the sample. O We need to know the TV viewing habits and behavior of the parents as well. O We need to know if all of the children could talk or not. O We need to know if all the children watched at least some TV