What is a voluntary response sample? choose the correct answer below. a. a sample in which the researchers decide which subjects to include in the study. b. a sample in which the response "no opinion" or "not applicable" are choices. c. a sample in which the sample size is very large. d. a sample in which the subjects themselves decide whether to be included in the study.

D. A sample in which the subjects themselves decide whether to be included in the study.                                                                                                                                  

Explanation:

Voluntary response sample: This is a sample made up of volunteers. These samples are mostly biased. For example, a person being called in a radio show poll might have powerful opinions over a topic in any direction. In a voluntary random sample, chooses themselves by answering a common appeal.  These samples are unreliable because they are bias, hence the result is usually biased.

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