Differentiate between the following highlighting their uses in epidemiological studies:

 i) Incidence and Prevalence 

ii) Quota sample and snowball sample

iii) Cross sectional and correlational study

b) Enlist the various factors affecting the choice of sampling method. Write down characteristics of a good sample

i)

In epidemiology, incidence is a measure of the probability of occurrence of a given medical condition in a population within a specified period of time. Although sometimes loosely expressed simply as the number of new cases during some time period, it is better expressed as a proportion or a rate with a denominator.

In epidemiology, prevalence is the proportion of a particular population found to be affected by a medical condition (typically a disease or a risk factor such as smoking or seatbelt use) at a specific time. It is derived by comparing the number of people found to have the condition with the total number of people studied and is usually expressed as a fraction, a percentage, or the number of cases per 10,000 or 100,000 people. Prevalence is most __________ ___ ______ __________ ____ ___ __________ ___ _________ __________ _______ _______.
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