Answer:
Sara is part of the experimental group
Step-by-step explanation:
Eric and Sara both take part in a research study that is investigating the effects of practice on memory. Eric practiced for 10 hours straight before the memory test, while Sara reviewed the material 2 hours a day for a week before the test. In this study, Sara is part of the experimental group.
Eric and Sara are both part of the experimental group. However, they are most likely in different treatment groups. While Eric is in a treatment that requires 10 hours straight practice, Sara is in a treatment group that requires reviewing the materials to hours daily for a week prior to the memory test.