DrMorris Is Studying How Sleep Deprivation Affects Semantic Memory

Multiple Choice

Dr.Morris is studying how sleep deprivation affects semantic memory.He has each participant study a list of random facts and then undergo sleep deprivation for either 24 hours,30 hours,or 36 hours.Then,following an additional 48-hour delay period,each participant's memory for the random facts is tested.In this study,what is the independent variable?

A) number of random facts remembered
B) number of hours of sleep deprivation
C) 48-hour delay
D) the amount of time spent trying to remember the random facts