Top 10 Saddest Things that Can Happen in Life The Death of a Parent. This is should definitely be number one. ...
The Death of Your Child. This is by far the worst! ...
Getting Raped. ...
Suffering a Painful Death. ...
The Death of a Pet. ...
Getting Diagnosed With a Disease. ...
Having Suicidal Thoughts. ...
Receiving a Death Sentence.

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.