Gallup Youth Poll
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.
(a) Describe the sample.
(b) Describe the population from which the sample was selected.
(c) Is the sample representative of the population?
(d) What is the variable of interest?
(e) How is the inference expressed?
(f) Newspaper accounts of most polls usually give a margin of error (e.g., plus or minus 3%) for the survey result. What is the purpose of the margin of error and what is its interpretation?