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Representative Samples and Sampling Bias
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PSAT Prep
134 Representative Samples and Sampling Bias
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A school estimates the percentage of students who eat breakfast by surveying only students who are already in the cafeteria during breakfast service. Which direction of bias is most likely?
A
The estimate is exact because the sample was taken during breakfast.
B
The estimate may be too low because cafeteria students never eat breakfast.
C
The estimate is unbiased because every student is allowed in the cafeteria.
D
The estimate may be too high because students in the cafeteria at breakfast are more likely to eat breakfast.
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