Questions: A polling organization contacts 1230 adults who are 20 to 90 years of age and live in Europe and asks whether or not they had voted in the last federal electio What is the population in the study? A. Adults who are 20 to 90 years of age and live in Europe and have voted. B. Adults who are 20 to 90 years of age and have voted. C. Adults who are 20 to 90 years of age and live in Europe. D. Adults who are 20 to 90 years of age.

The answer is C: Adults who are 20 to 90 years of age and live in Europe.

Explanation for each option:

A. Adults who are 20 to 90 years of age and live in Europe and have voted.

• This option is incorrect because it specifies adults who have voted, whereas the study is interested in all adults within the age range living in Europe, regardless of whether they voted or not.

B. Adults who are 20 to 90 years of age and have voted.

• This option is incorrect because it does not specify that the adults live in Europe, which is a key part of the population being studied.

C. Adults who are 20 to 90 years of age and live in Europe.

• This option is correct because it includes all adults within the specified age range living in Europe, which is the population the polling organization is interested in studying.

D. Adults who are 20 to 90 years of age.

• This option is incorrect because it does not specify that the adults live in Europe, which is necessary to define the population in this study.