Errors in statistical decisions

Normal Distribution

Differentiate between validity and reliability of a research tool.

Single blind study - Double blind study

Observational study - Experimental study

What do you understand by probability and non-probability sampling? Explain the various methods of non-probability sampling. 

Differentiate between the following highlighting their uses in epidemiological studies: 

i) Open ended and close ended questionnaire 

ii) Cluster sampling and stratified sampling 

iii) Cross sectional and case control study