Answer :
A consumer magazine article titled "How Safe Is the Air in Airplanes" reports that the air quality, as quantified by the degree of staleness, was measured on 175 domestic flights.
The purpose of this article was to study about the safety of all flights as a whole.
Since all the flights cannot be measured within a reasonable time, a sample of 175 domestic flights were taken.
a) The population of interest would be the measure of safety of all the airplanes.
b) Sample is the 175 domestic flights selected
c) The characteristics of interest is the safety in travelling by air in Airplanes due to air quality.
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