The table below gives a rate schedule for a long-distance phone call between two regions using a national carrier. 
Explain why these different long-distance rates are contingent on the time of day.
Definitions:
Weights
Objects, often made of metal, used during exercise to increase strength or resistance training.
Heights
The measurement of how tall something or someone is, or the vertical distance from the bottom to the top.
Association
A statistical term indicating a relationship or linkage between two or more variables, without implying causation.
Linear Association
A relationship between two variables where the rate of change in one variable is constant with respect to the other.
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