An experimenter had one group of participants eat ice cream that was packaged in a red carton, whereas another group of participants ate the same flavoured ice cream from a green carton. Participants then indicated how much they liked the ice cream by rating the taste on a 1-5 scale. The independent variable in this experiment was the
a. ice cream ratings.
b. flavour of the ice cream.
c. colour of the carton.
d. gender of the participant.
Answer: colour of the carton.