Evaluate the Following Generalization(s), Identifying Sample, Population, Attribute of Interest

Essay

Evaluate the following generalization(s), identifying sample, population, attribute of interest, and the extent to which the claims involved are knowable. Consider carefully the size and diversification of the sample and the extent to which the population differs or may differ from the sample; remember, what's important is that the sample be representative.
Thirty percent of American people ages nineteen to thirty-nine diet at least once a month, according to a news syndicate poll released last November. These findings are based on telephone interviews with a random sample of people listed in the Los Angeles telephone directory.