Please answer as much questons as you can! Thanks! Select all statements below t
ID: 3501114 • Letter: P
Question
Please answer as much questons as you can! Thanks!
Select all statements below that are TRUE. Choose all that are true and none that are not.
Effectivesampling strategies can improve external validity
Randomization ensures a representative sample
Randomization is the main difference between experimental and non-experimental research
Sampling is the main difference between experimental and non-experimental studies
Simple random sampling must be accompanied by randomization
Randomization improves internal validity
The vast majority of experimental studies use stratified random sampling techniques
Sampling helps to distribute confounders evenly between groups in randomized controlled trials
Match each threat to internal validity with the strategy that BEST controls it:
Much higher attrition in one group compared to the other
Compensatory demoralization
Compensatory equalization
Regression to the mean
Instrumentation
History
Testing
Selection interaction
Intent to treat analysis
Participant blinding
Researcher/staff blinding
Reliable outcome measures
Calibration and documentation
Participants document activities outside of study
Practice/warm-up sessions
Careful randomization
QUESTION 8
In a two factor, factorial design RCT of treatment for lateral epicondylitis, there are two independent variables - manual therapy v sham, and exercise therapy v placebo ultrasound. How many groups or 'arms' are running in this study?
6
8
4
2
1.Effectivesampling strategies can improve external validity
2.Randomization ensures a representative sample
3.Randomization is the main difference between experimental and non-experimental research
4.Sampling is the main difference between experimental and non-experimental studies
5.Simple random sampling must be accompanied by randomization
6.Randomization improves internal validity
7.The vast majority of experimental studies use stratified random sampling techniques
8.Sampling helps to distribute confounders evenly between groups in randomized controlled trials
Explanation / Answer
1. Effective sampling strategies can improve external validity - True.
2. Randomization ensures a representative sample - False.
3. Randomization is the main difference between experimental and non-experimental research - True.
4. Sampling is the main difference between experimental and non-experimental studies - False.
5. Simple random sampling must be accompanied by randomization - False.
6. Randomization improves internal validity - True.
7. The vast majority of experimental studies use stratified random sampling techniques - False.
8. Sampling helps to distribute confounders evenly between groups in randomized controlled trials - False.
Please post the other questions separately as we are supposed to answer just one question or four sub parts of the same question.