Biased and Unbiased-Understanding Sampling Methods in Statistics

What does it mean if a sample is biased?

• It is selected randomly from the population.

• It includes only people who volunteer.

• It represents the whole population equally.

• It favors one part of the population over others.

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CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

What does it mean if a sample is unbiased?

• It includes only people who volunteer.

• It does not represent the whole population.

• It is selected based on convenience.

• It gives everyone an equal chance to be chosen.

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CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

What is a simple random sample?

• Surveying people who are easy to reach.

• Surveying only people who volunteer.

• Choosing every nth person for the survey.

• Randomly picking names from a hat where everyone has an equal chance.

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CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

In which scenario is a simple random sample used?

• Surveying people who are easy to reach.

• Surveying people who volunteer to respond to a survey.

• Choosing names from a hat where each has an equal chance.

• Asking every fourth person at a ticket counter.

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CCSS.HSS.IC.B.3

Which sampling method involves selecting every nth individual?

• Simple random sample

• Systematic random sample

• Convenience sample

• Voluntary response sample

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CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

What is a characteristic of a convenience sample?

• It is randomly selected.

• It includes a system of selection.

• It is easy and close at hand to the surveyor.

• It represents the whole population.

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CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

What type of sample is likely to be biased if only family members are surveyed?

• Convenience sample

• Systematic random sample

• Simple random sample

• Voluntary response sample

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CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

What is a voluntary response sample?

• A method where participants choose to respond if they wish.

• A method where only convenient participants are surveyed.

• A method where every nth person is surveyed.

• A method where participants are chosen randomly.

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CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

Which example represents a systematic random sample?

• Allowing people to call in voluntarily to a radio show.

• Surveying only the baseball team members.

• Asking a class to put names in a hat and drawing one.

• Surveying every 10th person exiting a store.

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CCSS.HSS.IC.B.3

Which sampling method might result in skewed opinions about a new mall?

• Voluntary response sample

• Simple random sample

• Convenience sample

• Systematic random sample

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CCSS.HSS.IC.B.3