An investigator conducts an experiment involving the effects of three levels of a drug on memory. Subjects are randomly assigned to one of three conditions. A different drug level is administered in each condition. Memory is measured 10 minutes after each subject receives the drug. The following scores are recorded. The higher the score, the better the memory. 
ΣS between = _________.
Definitions:
Abbreviation
A compressed form of a word or phrase.
Magnetic Resonance Imaging
A diagnostic technique that uses magnetic fields and radio waves to create detailed images of the body's internal structures.
Fracture
A break in a bone or a hard substance.
Abbreviation
The process or result of shortening a word or phrase by omitting letters, often used to save space or for convenience.
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