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Sample size determination

Sample size determination is an important step in conducting research since it should provide the necessary information about the population of the study. In case the sample size is smaller than expected, the obtained results of the study cannot be generalized to the target population. On the other hand, the larger the sample size the more precise the findings. However, it is not usually possible to have a large sample size due to research limitations, such as cost, time, or the convenience of collecting the data. There are different approaches to calculate the sample size:


Observational studies

The main aim of these studies is not only to describe and express the status of the present situation, but also to identify and compare the relationships between two or more variables and their impact in different groups.

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Descriptive studies

Descriptive research is a type of research method which explains the existing phenomenon without considering the causes of the phenomenon under the study. In this regard, the data is collected through investigating the effect of the phenomenon on the investigated the population. There is a need to consider the following three characteristics in descriptive research: