Question

this quiz will test your knowledge on populations, samples and hypothesis. click the start button to begin. value: 2 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 sample should have included students from other schools. b. the sample was probably biased toward students who go to the library more often. c. the survey should have been conducted during the school year. d. the sample should have included teachers as well as students.

Explanation:

Rachel surveyed students who were already at the library on one night. These students are likely to be those who visit the library more frequently compared to the general student population at the middle - school. So, the sample is biased towards students with higher library - visiting frequency.

Answer:

B. The sample was probably biased toward students who go to the library more often.