Page 28 - TB_6B
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Learn about biased and unbiased samples.
When you collect data in a survey, your sample should represent the whole
population. If certain groups from the population are not represented by the
sample, the sample is a biased sample. Every individual in that population
should have an equal chance of being selected. If every individual has an
equal chance of being selected, the sample is an unbiased sample.
A survey is being conducted at the school to find students’ favorite music
genres. Jessica, Ricky, Ann, and Ryan selected their samples.
Find the biased samples.
50 students were randomly 50 dance club members were
selected. randomly selected.
50 boys were randomly 50 first graders were
selected. randomly selected.
Your sample includes only How about other
dance club members. people s samples?
Every individual in the
population should have an
equal chance of being selected.
So, your sample is biased.
Ann’s and Ryan’s samples are also biased. Explain why.
18. Perfect Samples 17
When you collect data in a survey, your sample should represent the whole
population. If certain groups from the population are not represented by the
sample, the sample is a biased sample. Every individual in that population
should have an equal chance of being selected. If every individual has an
equal chance of being selected, the sample is an unbiased sample.
A survey is being conducted at the school to find students’ favorite music
genres. Jessica, Ricky, Ann, and Ryan selected their samples.
Find the biased samples.
50 students were randomly 50 dance club members were
selected. randomly selected.
50 boys were randomly 50 first graders were
selected. randomly selected.
Your sample includes only How about other
dance club members. people s samples?
Every individual in the
population should have an
equal chance of being selected.
So, your sample is biased.
Ann’s and Ryan’s samples are also biased. Explain why.
18. Perfect Samples 17
