Use the following to answer Questions
A researcher is looking at the effects of competition versus cooperation on mathematics learning. She theorizes that anxiety will interact with type of instruction to influence math learning. The dependent variable is the number of points on a 100 point mathematics test. The means for the study results are shown in the table below. 
-Which of the following pairs of means is indicative of the main effect of Instruction type?
Definitions:
Life-Support System
Technology or equipment designed to maintain human life under critical conditions by providing necessary conditions or vital functions.
Embryo
An early stage in the development of a multicellular organism, following fertilization and before fetal stage in mammals.
Amnion
Prenatal life-support system that is a bag or envelope containing a clear fluid in which the developing embryo floats.
Placenta
A life-support system that consists of a disk-shaped group of tissues in which small blood vessels from the mother and offspring intertwine.
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