Which statement about bias is true?
I. Bias results from random variation and will always be present.
II. Bias results from a sampling method likely to produce samples that do not represent the population.
III. Bias is usually reduced when sample size is larger.
A) II and III only
B) II only
C) III only
D) I and III only
E) I only

Question

Quizplus · Accepted Answer

Statement II is true because bias occurs when the sample is not representative of the population due to a flawed sampling method. Statement I is incorrect because bias is not a result of random variation, but rather systematic error. Statement III is also incorrect because a larger sample size does not necessarily reduce bias, it only reduces random variation. Therefore, the correct answer is option B - II only.

Which Statement About Bias Is True