Re:Topic 3 DQ 2
Sampling theory encompasses a selection process that accurately selects the appropriate group of subjects to best benefit and represents the purpose of the intended study. A suitable group of subjects may include people, situations, objects or components used to measure responses. The method of sampling defines the process used to select subjects. (Grove, Gray, & Burns, 2015, p. 249-250).
Major thought processes in sampling theory include a population of subjects, intended subjects, defined criteria, accessibility, variables, timeframes, methods, and strategies. Clearly defining the intended research, research goals, research objectives and intended outcome will aid in a productive research project.
In 1948, a prominent longitudinal study began known as the Framingham Heart Study. The goal of the study was to follow a select group of people over an extended duration of time to identify commonality if characteristics of cardiovascular disease. The study specifically looked at a sample size of 5,209 men and women between the ages of 30 and 59 who had not developed symptoms of cardiovascular disease or had suffered a myocardial infarct or cardiovascular accident. (“Epidemiological Background and Design: The Framingham Study,” 2017). The Framingham Heart Study was a random sampling of voluntary subjects that resided in Framingham, Massachusetts.
In nursing and medical research many times the sample size, population, and characteristics represent the area of study. The population might be teenage pregnancies occurring in children 15-18 years old or infection rates among all patients who have hip replacement surgery. Other sample methods for more generalized research may not be so specific, but some control needs to be established in regards to sampling to avoid a study with no boundaries.