Examlex
The angle between two plane mirrors that meet at one edge is 45°. The change in direction of a ray that strikes the first mirror at a 60° angle of incidence when that ray reflects from the second mirror is
Mean
The average value of a set of numbers, calculated by dividing the sum of all the values by the number of values.
Least Squares
Least squares is a mathematical method used to find the best-fitting line or curve to a set of points by minimizing the sum of the squares of the differences between the observed and estimated values.
Squared Vertical Distances
The square of the vertical distance from each data point to a line (often in the context of regression analysis), used to measure deviation or error.
Regression Analysis
A statistical method for examining the relationship between a dependent variable and one or more independent variables.
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