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Discuss the possible reasons why early Mesopotamia saw so many different civilizations and empires, from the Sumerians to the Akkadians and the Babylonians, while civilization in the Nile Valley remained essentially unchanged for three millennium.
Interaction
In statistics, the effect of two or more variables is not simply additive, meaning their combined effect is different from what would be expected based on their separate effects.
Step-aerobics
A form of aerobic exercise involving stepping up and down on a stationary block in different patterns and intensities.
Test Statistic
A calculated value from sample data used to test a hypothesis in statistical testing, determining whether to reject the null hypothesis.
μ
The symbol commonly used to represent the mean or average of a population in statistics.