Question: Sleepless nights How much sleep do high school students get on a typical school night? An interested student designed a survey to fi nd out.

Sleepless nights How much sleep do high school students get on a typical school night? An interested student designed a survey to fi nd out. To make data collection easier, the student surveyed the fi rst 100 students to arrive at school on a particular morning. Th ese students reported an average of 7.2 hours of sleep on the previous night.

(a) What type of sample did the student obtain?

(b) Explain why this sampling method is biased. Is 7.2 hours probably higher or lower than the true average amount of sleep last night for all students at the school? Why?

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