Which of the following types of samples is almost always biased?
A)Simple random samples.
B)Stratified random samples.
C)Cluster samples.
D)Self-selected samples.

Question

Quizplus · Accepted Answer

Self-selected samples are almost always biased because the sample is composed of individuals who choose to participate, which may not accurately represent the population being studied. Those who choose to participate may have certain characteristics that differ from those who choose not to participate, leading to a biased sample.

Which of the Following Types of Samples Is Almost Always