Inexpensive since they require a very short period of time to conduct and complete the study All of the above First and

[answerhappygod]

Inexpensive since they require a very short period of time to
conduct and complete the study
All of the above
First and second only
Question 4 (1 point)
Confounding variables are relevant characteristics not included
in a research study that may directly affect the results and might
therefore interfere with credibility.
Question 4 options:
Question 5 (1 point)
Research studies are not perfect and flaws can exist due to
bias. Types of bias that might occur in case-control studies
include:
Question 5 options:
Recall bias
Selection bias
Misclassification bias
All of the above
First and second only