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Study Population (Defining the target population (homogeneous X…
Study Population
Sampling
Techniques
Probability
Types
disproportional
cluster
stratified
systematic
simple random
Disadvantages
: expensive; time-consuming; list of population needed
Advantages
: randomized; objectiveness
Non-probability
Error
- predicted and calculated
standard error
coefficient of variance
P values
confidence intervals
Bias:
a threat to external validity
Defining the target population
homogeneous X heterogeneous:Response to treatment
Safety issues
which Phase?
internal X external Validity