Question 24·Hard·Evaluate Statistical Claims: Observational Studies and Experiments

Because the sample size is large, the poll provides an accurate estimate of the percentage of all city residents who favor the dog park.

The voluntary nature of the online poll may have produced a biased sample that is not representative of all city residents.

Exactly 32% of all city residents oppose building the dog park.

If the poll had remained open for four weeks instead of two, the percentage favoring the dog park would necessarily have been different.