Question

populations, samples and hypothesis
this quiz will test your knowledge on populations, samples and hypothesis.
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value: 2
bill wanted to know how many times students at his middle school go to the beach each week during the summer. he surveyed every other middle school student at the mall last saturday. after analyzing the data collected, bill determined that the average student from his middle school goes to the beach about 2.4 times a week during the summer. what error did he make in the survey?

a. the sample probably contained students from other schools.
b. high school students should have been included in the sample.
c. the sample should have included teachers as well as students.
d. the sample should have included students from other schools.

Explanation:

Bill wanted to know about his middle - school students but surveyed at the mall. There's a high chance the sample had students from other schools, which would skew the results for his specific population of interest (students at his middle school).

Answer:

A. The sample probably contained students from other schools