You read the following headline in an old newspaper you find in the attic: “Government Cutbacks Send Indian Reservations into Violence, Sickness, Poverty.” Without looking at the date, which twentieth-century decades does this headline BEST describe? A.
1920s and 1950s
B.
1930s and 1940s
C.
1950s and 1960s
D.
1980s and 1990s

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.