EBM Flashcards
1
Q
How could you reduce random error
A
Standardize measurement
Percise instrument
Increase sample size
2
Q
What is a random sample?
A
Every member of the population has equal chances of being selected
+ a sample frame
3
Q
Why random sampling ?
A
To avoid selection bias
4
Q
When does a sample become unrepresentative ?
A
When low response rates by certain groups
5
Q
Potential bias arise from what percent of response rate?
A
More than 10-20%
