A hypothetical experiment is conducted whose purpose is to determine whether the nutritional benefits of green tea can have a beneficial effect on the exam performance of Stat 001 students.Reference: Ref 5-12
In the spring term, Stat 001 lectures will be given at 10:30 A.M. rather than at 8:30 A.M. The time of lecture (8:30 or 10:30) is
A. the response variable.
B. a lurking variable.
C. a stratum.
D. an explanatory variable