_______ attached to television sets in participating homes now record when the set is on and to which channel it is tuned.
A) Tachistoscopes
B) Polygraphs
C) GPS systems
D) Audiometers
E) Galvanometers
Answer: D
_______ attached to television sets in participating homes now record when the set is on and to which channel it is tuned.
A) Tachistoscopes
B) Polygraphs
C) GPS systems
D) Audiometers
E) Galvanometers
Answer: D