Week 14 Flashcards
1
Q
- The p value indicates?
a. The percentage of time the results reported would have occurred by chance alone
b. The decision criterion used
c. The probability of selection
d. The percentage of time the results reported would not have occurred by chance alone
A
a. The percentage of time the results reported would have occurred by chance alone
2
Q
- A p value of
A
c. Less than 1% chance of an error in rejecting the null hypothesis
3
Q
- When reporting that, from study findings, the effect of a new treatment on reducing wound healing time in the population from which the sample was drawn, is -2 to +2 days with 95% confidence, this means that?
a. The treatment should be implemented for all wounds because it reduces wound healing time
b. The treatment was shown to be ineffective in this study, but there is a 5% chance that this finding is incorrect
c. The standard deviation in reduced wound healing time is 4 days
d. The treatment should not be implemented based on this study because there is no indication that it will be effective
A
d. The treatment should not be implemented based on this study because there is no indication that it will be effective
4
Q
- Which of the following are used to determine if a finding has clinical significance?
a. The p value
b. Confidence intervals
c. Effect size
d. All of the above
A
d. All of the above
5
Q
- In a large, randomly selected sample of patients who have had major thoracic surgery, patients are asked to rate their pain during the post-operative period. There is a significant positive correlation between pain scores and the length of the main incisions (r=0.10, p = 0.01, alpha = 0.05). What would be the most appropriate interpretation of the findings?
a. The longer the man incision, the more intense the pain is likely to be, in this population
b. The longer the main incision, the less intense the aoin is likely to be, in this population
c. Large wounds cause greater pain in this population
d. Surgeons should change the length of their incisions
A
a. The longer the man incision, the more intense the pain is likely to be, in this population
6
Q
- In which of the following cases would a t-test be appropriate?
a. Comparing cholesterol levels between two groups of athletes
b. Looking for an association between blood cholesterol and hours of exercise in a single group of office workers
c. Looking for a relationship between gender and use of sunscreen among high school students
d. None of the above
A
a. Comparing cholesterol levels between two groups of athletes
7
Q
- In which of the following cases would a chi-square test be appropriate?
a. Comparing cholesterol levels between two groups of athletes
b. Looking for an association between blood cholesterol and hours of exercise in a single group of office workers
c. Looking for a relationship between gender and use of sunscreen among high school students
d. None of the above
A
c. Looking for a relationship between gender and use of sunscreen among high school students
8
Q
- In which of the following cases would a regression analysis be appropriate?
a. Comparing cholesterol levels between two groups of athletes
b. Looking for an association between blood cholesterol and hours of exercise in a single group of office workers
c. Looking for a relationship between gender and use of sunscreen among high school students
d. None of the above
A
b. Looking for an association between blood cholesterol and hours of exercise in a single group of office workers
9
Q
- Which of the following tests could be used to compare the mean blood alcohol levels of four groups of drinkers?
a. Chi square
b. ANNOVA
c. T-test
d. Pearson’s correlation
A
b. ANNOVA
10
Q
- Which of the following is an example of a non-parametric test?
a. T-test
b. Analysis of variance
c. Mann-Whitney u – test
d. Pearson’s correlation
A
c. Mann-Whitney u – test
