In a study described in the American Journal of Sports Medicine, Peter D. Frankl
ID: 3179867 • Letter: I
Question
In a study described in the American Journal of Sports Medicine, Peter D. Franklin and colleagues reported on the accuracy of using magnetic resonance imaging (MRI) to evaluate ligament sprains and tears on 35 patients. Consecutive patients with acute or chronic knee pain were selected from the clinical practice of one of the authors and agreed to participate in the study. a. Describe the sampling plan used to select study participants. b. What chance mechanism was used to select this sample of 35 individuals with knee pain? c. Can valid inferences be made using the results of this study? Why or why not? A study of nearly 2000 women included questions dealing with child abuse and its effect on the women's adult life. The study reported on the likelihood that a woman who was abused as a child would suffer either physical abuse or physical problems arising from depression, anxiety, low self-esteem, and drug abuse as an adult. a. Is this an observational study or a designed experiment? b. What problems might arise because of the sensitive nature of this study? What kinds of biases might occur?Explanation / Answer
Ans
1] MRI
a] Describe the sampling plan used to select study participants.
Ans -> A convenience sample has been performed.
b] What chance mechanism was used to select this sample of 35 individuals with knee pain?
Ans -> Consecutive patients were questioned, it's not a random process.
c] Can valid inferences be made using the results of this study? Why or why not?
Ans -> The fact the subjects were not randomly chosen means there may be bias in the types of injuries, confounding variables may be present .
2] Child Abuse
a] Is this an observational study or a designed experiment?
Ans -> This is an Observational study.