Assign the correct research method to the example:

Assign the correct research method to the example: Naturalistic Observation, Experimental Research Design, Correlational Design, Case Study, Survey

A questionnaire is given to a sample of high school students from across the county and the responses are tallied and compared. 

A researcher watches and records the social behavior of individuals during a major holiday sale at the mall

A sample of individuals is divided into two groups, one of which receives an antidepressant that is being studied, and the other that receives a sugar pill

Three individuals who have been diagnosed with a rare disorder are studied in detail, and the researcher makes comparisons between them to better understand the disorder

A researcher records the number of students who receive a passing grade in a new course, and compares it to the number of students who receive a passing grade in the previous version of the course