Name Assignment (circle, as instructed): Date Due problems 1 2 3 4 5 6 ALL Factorial Designs Exercise I (36 points) Instruction: Identify the following designs and manipulated variables. If the design is a mixed design, identify the correlational variable(s). If the design is a repeated measures, indicate which factor is repeated. Design 1 (6 points) College sophomores were given a short course in speed reading. Three groups had courses lasting for 5, 15, or 25 sessions. At the conclusion of the course, participants were asked to read a paragraph, followed by a test of comprehension. Before taking the test, participants in each group were offered a money incentive - no money, $1, or $10 for a certain level of performance. The investigator collected the reading time and number of correct items on the comprehension test for each participant. _
Factorial Designs Exercise I (continued) Design 2 (6 points) Males participated in an experiment to investigate factors that influence their degree of sexual attraction toward women. Participants drank "cocktails" containing no alcohol, one ounce, two ounces, or three ounces of alcohol. After "drinking up," each participant was exposed to an arousing stimulus: a Playboy centerfold, a written erotic story, or romantic music (Robert Goulet sings "Tchaikovsky). After exposure, participants rated their arousal level and the attractiveness of a college coed in addition to physiological measures of arousal (heart rate and GSR). _
Design 3 (6 points) A researcher interested in weight control wondered whether normal and overweight individuals differ in their reaction to the availability of food. Thus, normal and overweight participants were told to eat as many peanuts as they desired while working on a questionnaire. One manipulation was the proximity of the peanut dish (on the participant s desk or the experimenter s desk); the second manipulation was whether the peanuts were unshelled or shelled. After filling out the questionnaire the peanut dish was weighed to determine the number of peanuts consumed. _
Design 4 (6 points) A researcher studied the influence of intensity of room illumination (low, medium and high) on reading speed in 5th graders. Also, children were classified as "good" or "bad" readers from achievement test scores. Each group of children read 750 word passages under all three levels of illumination (three reading trials). The order of the trials for each child was randomly determined. _
Design 5 (6 points) A researcher investigated the effect of a child' s hair length on judgments of his/her personality and intelligence. Teachers were given photographs of children to obtain their "first impression" of students. Each teacher was given a picture of a boy or girl whose hair was either very short, about shoulder length, or very long. Teachers rated the friendliness of the children and were then asked to evaluate the child s intelligence as above average, average or below average. _
Design 6 (6 points) An investigator was interested in the effects of various treatments on the reduction of fear in phobic participants. He suspected that the type of phobia may interact with therapeutic treatments, specifically that the types of treatment effective for agoraphobics (fear of open spaces) and claustrophobics (fear of closed spaces) may be different. He therefore divided his subjects into two groups on the basis of type of fear, and then assigned members of each group to treatment groups: desensitization, insight, attention-placebo, or no-treatment control. After 3 months, participants' anxiety in the feared situation was measured. _