Answer:
Explanation:
Hello!
To easily identify these items you have to ask yourself the following questions:
1)
Who I want to study?
Answer: Workers age 16 or older from Arizona
The population of the study is all the experimental units in existence, in this case
Population: Workers age 16 or older from Arizona
The sample is a part of the population of interest, normally representative of the population and randomly selected, that the researcher uses to study.
In this case, the sample taken is: 5000 Arizona workers age 16 or older
The individual is defined by each experimental unit that conforms the sample, in this case
Individual: One Arizona worker age 16 or older.
2)
What do I want to study?
Answer: The percentage of people who use the train to get to work
The variable of interest is the characteristic that the researcher will measure in each experimental unit:
Variable: "The percentage of Arizona workers age 16 or older who use the train to get to work"
I hope this helps!