An executive for a large company is considering a change to health insurance plans offered to the employees. To assess employee satisfaction with the current plan, the executive sends an email to all company employees asking their opinion of the current plan. A summary of the results received shows that 27 percent of company employees are "highly satisfied” with the current health insurance plan. Which statement about the results is most likely to be true?

Although the email was sent to all employees, only employees who chose to reply are represented in the results. If satisfaction is related to whether someone responds, the estimate can be biased; for example, dissatisfied employees might be more likely to reply than satisfied employees. This is nonresponse bias, so the 27 percent may not reflect all employees’ opinions. Choice D describes this concern, though its example of satisfied employees not responding is only one possible way nonresponse could skew the results.

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