Expenso Fixed or
Variable
Expense?
Averago
Monthly
Cost
Yearly Cost
Percent of
Yearly Budget
(Rounded)
$4,800
9.8%
$48,900
Income Tax
Fixed
$400
$4,800
Housing
$950
Food
$7,800
Clothing
Variable
$75
Transportation
Fixed
$6,000
Insurance & Medical
$1,200
Entertainment
$100
$1,200
Emergency Fund
Fixed
$50
Savings for College
Fixed
$600
Savings for Retirement
$100
$1,200
Total
$4,075
$48.900
100%

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.