What additional information is obtained by measuring two individuals on an ordinal scale compared to a nominal scale?
a. the direction of the difference
b. the size of the difference
c. whether the measurements are the same or different
d. none of the other options is correct

Liquid ammonia is produced at high temperatures and under great pressure in a tank by passing a mixture of nitrogen gas and hydrogen gas over an iron catalyst. the reaction is represented by the following equation. n2(g) + 3h2(g) → 2nh3(g) changing all but one experimental condition will affect the amount of ammonia produced. that condition is a) increasing the concentration of both reactants b) changing the temperature within the tank c) decreasing the pressure within the tank. d) increasing only the amount of nitrogen present.