Question

Rachel is conducting an experiment to approximate how many times students at her middle school go to the library each week during the school year. In order to accomplish this, she surveys 18 students from the school who are at the library one night. After analyzing the results of her study, Rachel determines that on average students from her middle school visit the library 2.1 times per week during the school year. What error did she make in the survey?a. The survey should have been conducted during the school year.b. The sample was probably biased toward students who go to the library more often.c. The sample should have included teachers as well as students.d. The sample should have included students from other schools.

Answer 1

As she did the survey at night in the library it is probable that the sample is biased toward students who go more often to the library. So the answer is b