Leslie is running for a political office. She wants to poll adults in her district to understand their stances on various issues relevant to the upcoming election. Members of her campaign will contact randomly chosen adults by telephone.
Which of these is the best example of undercoverage?
Choose 1 answer:

A:Some adults chosen won't answer the phone.

B:If her campaign chooses numbers from the phonebook, they won't contact adults with unlisted numbers and adults who only use cell phones.

C:Some adults who answer the phone may choose to not participate in the poll.

D:They might contact people who aren't registered voters in that district.

E:People may not give accurate answers to the questions depending on how they are worded.

Undercoverage of the people in the district will happen if B: her campaign chooses numbers from the phonebook, they won't contact adults with unlisted numbers and adults who only use cell phones.

Undercoverage occurs when the sample used to model a population does not adequately cover the population.

By using only the phonebook to select people from the district for the sample, people who aren't listed or have only a cellphone will not have a chance to be in the sample so this is undercoverage.

Other options are wrong because:

The poll will account for some adults not picking the phone, refusing to participate or being voters from another district
The coverage of the poll is not affected by the accuracy of the answers

In conclusion, undercoverage will occur if the campaign uses a phonebook to select the sample.

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