Choose whether the following describes an experiment or an observational study: A student is trying to determine if there is an appreciable difference between the satisfaction that a student receives in their lunch if they eat a majority of vegetables or carbohydrates. She obtains a group of students and randomly feeds half the group lunches that are primarily vegetables and the other half lunches that are primarily carbohydrates. She then administers a short survey on their lunch satisfaction and compares the results of the two groups. Click on the correct answer: Observational Study Assignment of Treatment Experiment

The scenario described involves a student who is actively manipulating the lunch options for two groups of students, assigning one group to eat primarily vegetables and the other primarily carbohydrates. This is a deliberate intervention to observe the effect of the type of lunch on student satisfaction. Since the student is controlling the independent variable (type of lunch) and randomly assigning students to the treatment groups, this is an experiment. An observational study, on the other hand, would involve observing subjects without manipulating any variables or assigning treatments. Therefore, the correct answer is "Experiment".