Suppose a quality control inspector pulls every tenth can of soup from a conveyor belt to ensure that the cans are filled to capacity. How should this procedure be evaluated?
A) The sample may not be a random sample.
B) The procedure is defective because it fails to specify which can is selected first.
C) The procedure guarantees that the sample is a random sample.
D) The sample is not large enough for the kind of test being done.
E) The procedure calls for an excessively large sample.

Question

Quizplus · Accepted Answer

Since the inspector is only selecting every tenth can, this may not be a truly random sample as certain cans may have a better chance of being selected than others. Therefore, option A is the best choice.

Suppose a Quality Control Inspector Pulls Every Tenth Can of Soup