A Gallup Youth Poll was conducted to determine the topics that teenagers most want to discuss with their parents

A Gallup Youth Poll was conducted to determine the topics that teenagers most want to discuss with their parents. The findings show that 46% would like more discussion about the family's financial situation, 37% would like to talk about school, and 30% would like to talk about religion. The survey was based on a national sampling of 505 teenagers selected at random from all U.S. teenagers.

Answer the following questions:

a) Describe the sample and the population from which the sample was selected.

b) Is the sample representative of the population? Explain your answer.

c) What is the variable of interest in this study?