What is the plaintiffs’ main concern about the state of public schools in Brown v. Board of Education? The curriculum was outdated and biased, which led to a poor quality of education in Topeka. The teachers were not credentialed, which led to disparities within the Topeka school system. The schools were racially segregated, which led to a lower quality of education for some students in Topeka. The school buildings were in poor condition, which caused low attendance rates in Topeka.

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.