A cell phone's SAR (Specific Absorption Rate) is a measure of the amount of radio frequency (RF) energy absorbed by the body when using a cell phone.The rate can vary by the distance of the phone from the ear.Below is a table showing SAR (y) and distance (x) for a sample of five 10 minute calls. 
The slope of the least squares line is 59.6.The intercept is -12.Compute the "total variation" (SST) .
Definitions:
Forecast Value
The estimated or predicted value of a variable or set of variables at some point in the future.
Mean Square Error
A measure of the average of the squares of the errors—that is, the average squared difference between the estimated values and the actual value.
Sales Details
Specific information regarding the transactions, quantities, prices, and conditions under which sales activities occur.
Value of K
Often refers to a constant in various contexts, such as a specific parameter value in a mathematical formula or algorithm.
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