10/27/2016 Week 2 (Oct 24 Oct 30) – PSYC330OL5016FA1 https://blackboard.campbell.edu/webapps/blackboard/content/listContent.jsp?content_id=_2095381_1&course_id=_36869_1&nolaunch_after_review=true&outco… 1/2 Lab Activity 2 PART A: Identifying experimental variables Identify the independent and dependent variables in the following descriptions of experiments: 1. Students watched a cartoon either alone or with others and then rated how funny they found the cartoon to be. 2. A comprehension test was given to students after they had studied textbook material either in silence or with the television turned on. 3. Some elementary school teachers were told that a child’s parents were college graduates, and other teachers were told that the child’s parents had not finished high school; they then rated the child’s academic potential. 4. Workers at a company were assigned to one of two conditions: one group completed a stress managementtraining program; another group of workers did not participate in the training. The number of sick days taken by these workers was examined for the two subsequent months PART B: Nonexperimental observations Respond to the following questions: 1. You observe that classmates who get good grades tend to sit toward the front of the classroom, while those who receive poor grades tend to sit toward the back. What are three possible cause andeffect relationships for this nonexperimental observation? 2. A few years ago, newspapers reported a finding that Americans who have a glass of wine a day are healthier than those who have no wine (or who have a lot of wine or other alcohol). What are some plausible alternative explanations for this finding; that is, what variables other than wine could explain the finding? 3. The limitations of nonexperimental research were dramatically brought to the attention of the public by the results of an experiment on the effects of postmenopausal hormone replacement therapy (part of a larger study known as the Women’s Health Initiative). An experiment is called a clinical trial in medical research. In the clinical trial, participants were randomly assigned to receive either the hormone replacement therapy or a placebo (no hormones). The hormone replacement therapy consisted of estrogen plus progestin. In 2002, the investigators concluded that women taking the hormone replacement therapy had a higher incidence of heart disease than did women in the placebo (no hormone) condition. At that point, they stopped the experiment and informed both the participants and the public that they should talk with their physicians about the advisability of this therapy. The finding dramatically contrasted with the results of nonexperimental research in which women taking hormones had a lower incidence of heart disease; in these studies, researchers compared women who were already taking the hormones with women not taking hormones. Why do you think the results were different with the experimental research and the nonexperimental research? Explain. PART C: Is it a correlation or is it an experiment? For the following questions, first answer whether the study described is a correlation or is it in experiment. If it is a correlation, is it positive or negative? If it is an experiment, what are the independent and dependent variables? 1. Dr. Snoop and Dr. Dre are interested in the effects of smoking marijuana on learning, so they place several ferrets in a box where if they press a lever they will get a food pellet. Some ferrets are exposed to pot smoke 3 times a day; some for 1 time a day, and some not at all. After two weeks of exposure they measure which groups of ferrets learn to push the lever faster. They find that less pot smoke is associated with faster learning. 2. Researchers are interested in the effects of bystanders on altruistic (helping) behaviors, they have someone pretend to have a seizure when either several people are present or only one person and then see if helping behaviors are affected. They find that people are more likely to help with fewer bystanders. 3. Researchers are interested in the effects of patterns of TV watching on children’s aggressive behavior. They have kids keep a diary of what they are watching and for how long and then […]
