17. A city council member wants to know how her constituents feel about a planned rezoning of the city's historic district. So, she randomly selects 100 names from the city phone directory and conducts a brief survey with each of them over the phone.

What is the population?

What is the sample?

• A. population: the 100 people who are selected

sample: those among themwho areregistered voters

• B. population: all the residents in the city

sample: all the registered voters in the city

• C. population: those listed in the city's phone directory

sample: the 100 people who are selected

• D. population: the registered voters in the city

sample: the 100 people who areselected

18. The owners of a professional basketballteam wantto determine what additional beverage options would sell well. So they select200 seat numbers at random during one of the team'shome gamesand surveythe occupants of those seats.

What is the population?

What is the sample?

• A. population: the arena's beverage options

sample: the occupants of the 200 selected seats

• B. population: the occupants of the 200selected seats

sample: the arena's beverage options

• C. population: all the attendees who bought a beverage at the game

sample: the occupants of the 200selected seats

• D. population: all the attendeesat the game

sample: the occupants of the 200selected seats

19. Many people with wealthy friends do not succeed in national politics. But no one succeeds in national politics without wealthy friends.

Having wealthy friends, then, is a ..., but not a ... condition for succeeding in national politics.

• A. necessary ... sufficient
• B. initial ... final
• C. sufficient .... necessary
• D. final ... initial