A researcher begins with a registry of all patients with HIV in the United States.The researcher uses a computer to generate a random sample from the list,and then those individuals agree to participate in a study.What kind of sample has been created?
A) Cluster
B) Convenience
C) Simple random
D) Stratified random

Question

Quizplus · Accepted Answer

Simple random sampling is when every member of the population has an equal chance of selection for the sample.Cluster sampling occurs when a researcher develops a sampling frame that consists of a larger division than the one desired and it is chosen randomly; then subjects from the chosen subsets are selected randomly.A convenience sample is based on any member of the target population that is easily accessible to the researcher.In a stratified sample,knowledge about characteristics of the population is used to create a sample that is representative of the larger population.

A Researcher Begins with a Registry of All Patients with HIV