STRATIFIED RANDOM Paradigm

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Question1

Public health aims to protect, promote and restore people's health through programmes, services and institutions that emphasize the prevention of disease and the health needs of the entire population. Public Health activities change with advances in technology as well as with changes in social values but its main aims remain the same: to reduce disease, premature death and disability in populations. An example on a public health intervention in South Africa is free primary health care which includes the provision of chronic medications for diseases such as HIV and diabetes. Government also offers vaccinations in the young to prevent debilitating diseases from developing.

A cohort study is an analytical study of the natural progression …show more content…

It enables comparability between different populations. Sampling helps determine the validity and the reliability of findings. Sampling saves resources and spares time.
In simple random sampling each person has an equal chance of being selected.
SIMPLE RANDOM SAMPLING Each person has equal chance of being selected Unit of study = individual Suitable where population is relatively small and where sampling frame is complete and up-to-date Procedure: – Obtain a complete sampling frame – Give each case a unique number, starting at one – Decide on the required sample size – Draw numbers from hat; use software – Select individuals according to numbers
STRATIFIED RANDOM SAMPLING Population divided into homogenous subsets called "strata” Within each stratum, use Simple Random sampling (SRS) to select a random sample Ideally there should be little variation of the characteristics of interest within a stratum and a large difference between strata

An outbreak is the occurrence of more than the expected number of cases of a disease over a particular time period, in a specified place and amongst a defined population. There are usually 2 or more cases with an epidemiological

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