Is the Sample Bias or Unbiased

question 7

Short Answer

Is the sample bias or unbiased?
a. A professor studying the attitudes of all sophomores at a college asks those who are enrolled in her psychology class. ________
b. A researcher doing a citywide survey on monthly spending at local grocery stores. ________
c. A magazine editor studying the opinion on a gun-control measure from all rifle owners, mails a questionnaire to only those who subscribe to her magazine. ________

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Definitions:

Miles Per Hour

Measures velocity, indicating how many miles can be covered in the span of an hour.

Compute

The process of calculating or determining something by mathematical or logical methods.

Miles Per Hour

A measurement of velocity indicating how many miles are covered within an hour.

Compute

Refers to the action of performing mathematical calculations or processing data using a computer or computational device.