An Experiment Tested Whether the Context of the Learning Environment

Multiple Choice

An experiment tested whether the context of the learning environment was important in memory recall.Sixteen people learned a list of 40 unrelated words either inside a room or outside of a house on a patio.Later they were asked to recall the words in either the same environment they learned the list of words in or the alternative environment.The number of correctly recalled words was measured.
What level of measurement is the independent variable?

A) interval
B) nominal
C) ordinal