Holly was dancing with her new boyfriend at an elvis tribute. when the band started playing "can't falling in love with you," her boyfriend gave her a long, passionate kiss, which holly found very enjoyable. now holly finds that every time she hears "can't falling in love with you" on the radio, she becomes a little flushed. in this example, the conditioned stimulus is

The authors of the paper "fudging the numbers: distributing chocolate influences student evaluations of an undergraduate course"† carried out a study to see if events unrelated to an undergraduate course could affect student evaluations. students enrolled in statistics courses taught by the same instructor participated in the study. all students attended the same lectures and one of six discussion sections that met once a week. at the end of the course, the researchers chose three of the discussion sections to be the "chocolate group." students in these three sections were offered chocolate prior to having them fill out course evaluations. students in the other three sections were not offered chocolate. the researchers concluded that "overall, students offered chocolate gave more positive evaluations than students not offered chocolate." indicate whether the study is an observational study or an experiment. give a brief explanation for your choice.