Which of the following is the BEST description of the relationship between local and state governments? 48A A.
Local governments cooperate with the state and county governments and help enforce state laws.

B.
Local governments are completely independent from state government.

C.
Local governments may be called on to assist the state government, but are under no obligation to do so.

D.
Local governments only have to assist state governments in national emergencies.

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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.