Archer daniels midland (adm) is a producer of food ingredients, sweeteners, cocoa, flours, vegetable oils, and protein products that are used in the manufacture of processed foods. adm does not make products that are typically sold to final consumers; it makes business-to-business products. however, adm is a major advertiser on news and public affairs programs that appear on national television networks. the main objective of adm's television commercials is to build goodwill for the company and to improve relations with current and prospective shareholders. adm is engaged in:
product advertising.

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.