A Researcher Conducts an Experiment to Determine Whether Moderate Doses

Multiple Choice

A researcher conducts an experiment to determine whether moderate doses of St.John's wort have any effect on memory for college students.For this study,what is the independent variable?​

A) ​The amount of St. John's wort given to each participant
B) ​The memory score for each participant
C) ​The group of college students
D) ​Whether or not they are full-time students