The father of a junior high school student wants to determine the most popular book among junior high students. Select the sample with the least potential bias.

A. A randomly selected group of 10 book sellers

B. A randomly selected group of 30 junior high students

C. A randomly selected group of 30 junior high students leaving the public library

D.

The group of 30 junior high students attending the birthday party of the
researcher’s child

Answer: B

Yes, B.

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To select the sample with the least potential bias, it is important to choose a group that is representative of the entire population of junior high students. The sample should be selected randomly, to ensure that every student has an equal chance of being included.

In this case, the option B provides a randomly selected group of 30 junior high students. This is the best choice because it directly represents the target population of interest. By choosing students randomly, the sample is less likely to be biased towards any specific group or have any outside influence.

Option A, a randomly selected group of 10 book sellers, may introduce bias as the perspective of book sellers may differ from that of junior high students.

Option C, a randomly selected group of 30 junior high students leaving the public library, may introduce bias because these students may have a greater interest in reading and may not represent the entire population of junior high students.

Option D, the group of 30 junior high students attending the birthday party of the researcher's child, may introduce bias as the researcher's child's friends may not be representative of the entire population of junior high students.

Therefore, option B is the most suitable choice for selecting a sample with the least potential bias.