DrBlack Wants to Study How Caffeine Consumption Affects Memory

Multiple Choice

Dr.Black wants to study how caffeine consumption affects memory.He gives his sample a memory test to establish their baseline abilities and then has them drink several caffeinated beverages,followed by another memory test.What type of research design is Dr.Black using?

A) Within-subject design
B) Correlational design
C) Between-subject design
D) Randomized design