Question

A Gallup Poll found that Americans, when asked about a list of environmental problems, were increasingly worried about problems such as pollution of drinking water, soil, air, and waterways, but were least worried about climate change or global warming. Gallup's report said, "Results are based on telephone interviews conducted March 6-9, 2014, with a random sample of 1,048 adults, aged 18 and older, living in all 50 U.S. states and the District of Columbia." What is the population for this sample survey?

A.) all adults, age 18 and older

B.) all adults, age 18 and older, living in all 50 U.S. states and the District of Columbia

C.) all Americans all Americans who are concerned about climate change

D.) all adults that were interviewed

What is the sample?

A.) the randomly selected adults who are concerned about climate change

B.) the randomly selected adults who are not concerned about climate change

C.) the 1048 adults randomly selected and interviewed

D.) all Americans

E.) all adults, age 18 and older

Answer 1

1. The population for the given sample survey is all adults, age 18 and older , living in all 50 U.S,. states and District of Columbia

2. The sample is the 1048 adults randomly selected and interviewed

Explanations

1. Population is the collection of all units. It is the set of similar items or events which is of interest. Thus population includes all members of a defined group that we are studying. So in the given problem population is all members of the defined group- adults, age 18 and older , living in all 50 U.S,. states and District of Columbia

2. Sample is the representative part of the population. It is a subset of the population. It is the sub-population from which data is collected. So in the given problem data is collected from 1048 adults randomly selected and interviewed, and hence it is the sample.