Kona wants to examine the TV-viewing habits of 18- to 25-year-old males in the United States. As it is impossible to include all males of this age group in her study, she selects a smaller group of 18- to 25-year old males to survey. The males included in her study are called a(n) .

Sample

Explanation:

Sample, in terms of study and research is defined as the participants or component group that is chosen for research that represents the complete population or item or other component.This sample is used for measuring and studying about the complete item group or population for generalized results.

According to the question, sample is represented through the males members chosen by Kona for her research. These male participants are representing the population of 18 to 25 year old males in the United states who watch television.

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.