Helppp Why is the Outback vital to the strength of the Australian economy?
1: Its vast supply of iron ore and coal make the region essential to the Australian mining industry.
2: Most of the continent's tourist destinations are located in the region due to its relatively mild climate year-round and numerous lakes and rivers
3: Its fertile soil allows the region to be a major contributor to the Australian agricultural industry.
4: Most of the continent's major manufacturing operations are located in the region due to its high population density and steady supply of labor.

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.