The Union for Concerned Scientists (UCS) maintains the Satellite Database-a list

Question

The Union for Concerned Scientists (UCS) maintains the Satellite Database-a listing of the more than 1000 operational satellites currently in orbit around Earth. Several of the many variables stored in the database include country of operator/owner, primary use (civil, commercial, government, or military), class of orbit (low Earth, medium Earth, or geosynchronous), longitudinal position (degrees), apogee (i.e., altitude farthest from Earth's center of mass, in kilometers), launch mass (kilograms), usable electric power (watts), and expected lifetime (years). Which of the variables measured are qualitative? Which are quantitative?

Explanation / Answer

Qualitative variables: Country of operator / owner, Primary use and Class of orbit. All these variables are categorical variables.

Quantitative variables: Longitudinal position, Apogee, Launch Mass, Usable electric power and Expected lifetime. All these variables take values or numbers.

(Ans).

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