What is sampling theory Describe it and provide examples to illustrate your definition. Discuss generalizability as it applies to nursing research.

Sampling theory was developed to determine the most effective way to acquire a sample that accurately reflects the population under study. Key concepts of sampling theory include populations, target population, sampling or eligibility criteria, accessible population, elements, representativeness, sampling frames, and sampling plans or methods.(Burns & Groves, 2013).A sampling plan or method outlines strategies used to obtain a sample for a study. Like a design, a sampling plan is not specific to a study. The plan is designed to increase representativeness and decrease systematic variation or bias. The sampling plan may use probability...