A researcher is studying whether a new knee implant is better than existing alternatives in terms of pain after knee replacement. She designs the study so that it includes all the surgeries performed at a certain hospital. Interestingly, she notices that patients who underwent surgeries on Mondays and Thursdays reported much better pain outcomes on a survey compared with those who underwent the same surgeries from the same surgeons on Tuesdays and Fridays. Upon performing further analysis, she discovers that one of the staff members who works on Mondays and Thursdays is aware of the study and tells all the patients about how wonderful the new implant is. Which of the following forms of bias does this most likely represent?
AHawthorne effect
BPygmalion effect
CAttrition bias
DGolem effect
A study is performed to determine the prevalence of a particular rare fungal pneumonia. A sample population of 100 subjects is monitored for 4 months. Every month, the entire population is screened and the number of new cases is recorded for the group. The data from the study are given in the table below: Time point New cases of fungal pneumonia t = 0 months 10 t = 1 months 4 t = 2 months 2 t = 3 months 5 t = 4 months 4 Which of the following is correct regarding the prevalence of this rare fungal pneumonia in this sample population?
AThe prevalence at time point 2 months is 2%.
BThe prevalence at time point 3 months is 11%.
CThe prevalence at the conclusion of the study is 15%.
DThe prevalence and the incidence at time point 2 months are equal.
EThe prevalence at the conclusion of the study is 25%.
Group of 100 medical students took an end of the year exam. The mean score on the exam was 70%, with a standard deviation of 25%. The professor states that a student's score must be within the 95% confidence interval of the mean to pass the exam. Which of the following is the minimum score a student can have to pass the exam?
A45%
B63.75%
C67.5%
D20%
E65%
+ 7 more in the PDF
Browse all chapters