Explain briefly the significance of control, manipulation and observation in an experimental study

Single blind study - Double blind study

Case – Control study - Intervention study

Observational study - Experimental study

Analytical study - Descriptive study

Briefly discuss different types of rating scales used in epidemiological studies.

Briefly discuss the characteristics of a good questionnaire. What are the advantages and limitations of using a questionnaire in a research study? 

Test the difference in the attitude of male and female subjects using chi-square analysis towards eating junk food based on the distribution given here with (at 0.5 level of significance):

Define the concept of confidence interval and degree of freedom with the help of an example.

Differentiate between two-tailed and one-tailed tests of significance. 

Given below are the hemoglobin level recorded for 10 subject in a community study: 8.8, 6.4, 10.3, 11.2, 12.5, 8.5, 9.0, 10.0, 11.0, 12.0

Calculation the mean, standard deviation and variance for the hemoglobin levels reported above.

Explain the various types of interviews? Write down different techniques used to conduct interview

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

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

 Correlation studies

Double bind trials

Clinical trials

Define hypothesis. Enumerate basic characteristics of a good hypothesis

Define research. What do you understand by the terms -Level of Significance and Power? Discuss their relevance in sample size determination. 

Adulteration and Misbranding