Question: A graduate student is interested in learning whether nurses get the recommended 7-8 hours of sleep a night. She mentions to her professor that she

A graduate student is interested in learning whether nurses get the recommended 7-8 hours of sleep a night. She mentions to her professor that she is planning on interviewing nurses during the night shift because she has classes during the day. Her professor remarks that she might want to reconsider because night shift nurses may not be representative of all nurses. This potential issue is an example of ___________.

Group of answer choices

Measurement error

Random error

Sampling bias

Rival hypotheses

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