Bchem 3

Question 1

Internal Validity

Answer 1

Measures the degree to which a study answers the question it set out to answer

Factors include:
Sample Size, Attrition, Subject variability, etc.

Question 2

External Validity

Answer 2

Measures the extent to which the study findings can be generalized

Factors Include: 
Population Characteristics
Subject selection 
Time 
Research Environment