Which statement about the great depression is correct? its major economic trouble was limited to the united states. its economic trouble affected almost all americans. its economic trouble began in the early 1920s. its major economic problems were limited to us agriculture.

The vietnam war was considered by many to be america’s first unopposed win independent war defeat

What did populists set their sights on after achieving some success on a local level in the late 1800s?

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.