Chat with AIExam 9: Experimental Research
Which of the following is LEAST suited to providing clear evidence about a CAUSAL relationship between two variables?
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Design an experiment to study the relationship between class attendance and exam grades. Which method is most appropriate for studying this relationship? Explain your answer.
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Answered by Examlex AI CopilotTo study the relationship between class attendance and exam grades, an experiment can be designed where students are randomly assigned to two groups: one group is required to attend all classes, while the other group is not required to attend any classes. Both groups would take the same exams and their grades would be compared at the end of the semester.
The most appropriate method for studying this relationship is a randomized controlled trial (RCT). RCTs are considered the gold standard for determining cause-and-effect relationships because they involve randomly assigning participants to different groups, which helps to minimize bias and confounding variables. In this case, by randomly assigning students to the attendance and non-attendance groups, we can be more confident that any differences in exam grades are due to the attendance policy and not other factors.
Additionally, using an RCT allows for the establishment of a clear control group, which is essential for comparing the effects of class attendance on exam grades. This method also allows for the collection of quantitative data, which can be analyzed using statistical methods to determine the strength and direction of the relationship between class attendance and exam grades.
Overall, a randomized controlled trial is the most appropriate method for studying the relationship between class attendance and exam grades because it provides a rigorous and systematic approach to determining causality and minimizing potential biases.
Dr. Marshall conducted an experiment to test changes in sex roles due to spending an entire day reading about the achievements of great women artists and scientists. The experimental group read fifteen articles about great women. The control group read fifteen articles about cooking, automobiles, astronomy, and accounting. During the lunch break, subjects from the experimental and control groups met and talked about what they were reading. What internal validity problem may occur?
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Dr. Bootsma designed and produced a 30 second radio commercial for a local automobile dealer. Next, she had the three most widely listened to radio stations in town play the commercial 15 times a day, everyday, for two weeks. She waited until the end of the two-week period, then she called Jack to see what his sales had been lately. What experimental design did she use?
(77) After conducting an experiment on group dynamics, Dr. Smith performed an ethical debriefing. What is Dr. Smith doing?
(75) Outline the components of the classical experimental design. How is it different from a one-group pretest posttest design?
(90) Why is control important in experimental research? How is it related to internal validity?
(83) Field experiments, compared to laboratory experiments, generally
(82) Compare and contrast field or laboratory experiments. Which has greater internal and external validity? Why?
(89) Describe the testing effect and its relation to the Solomon four-group design?
(78) Several people criticized Dr. Gordon's classroom experiment on the effects of density of living conditions on aggression due to issues of external validity. This means problems with
(63) The classical experimental design contains all of the following, EXCEPT
(71) Pete wanted to see whether caffeine intake increased a subject's arousal state. He randomly assigned 100 high school seniors to an experimental or control group. The experimental group drank a high caffeine soda, while the control group drank a caffeine-free soda. He then measured and compared arousal states for both groups. What type of design did Pete use?
(78) Explain why mortality, maturation, and history effects threaten a researcher's ability to demonstrate a causal relationship. Why are they more common in longer experiments?
(82) How do the interrupted and the equivalent time series designs differ?
(60) What is random assignment and why is it important when designing an experiment?
(72) Yolanda wanted to test the effectiveness of a new 4-hour anger management treatment session. She first took 24 clients who had been referred for anger management pre-test) in March and divided them randomly into two groups. One group was assigned to the new 4-hour session, the other group went to a traditional anger management session. Each was given an in-take assessment measuring anger management skills. After clients finished the two-week sessions, she measured the level of anger management skills among all clients in both groups. What experimental design did she use?
(77) During the course of her experiment, Yolanda learned that 7 of the 12 clients in her new 4-hour session had quit and walked out of the session before it was completed. What threat to internal validity does her experiment have?
(74) Dr. Duffy conducted an experiment to raise I.Q. scores by having experimental subjects eat three bananas a day for a month, while control groups had no bananas. Below are his results scores = average I.Q. score for group of subject). Pretest Posttest Experimental Group 102 110 Control Group 80 110 Which of the following can you say about the results?
(80) It has been discovered that researchers will often unknowingly treat the experimental group differently than the control group. To minimize this threat to internal validity, research will often direct research assistants who don't know who is in the experimental and control groups) to administer the experimental treatment. This is often called a
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