Data considerations for 3D Surface Plot

For the graph to represent your data most effectively, consider the following guidelines.

If possible, the x- and y-values should be spaced regularly to form a grid
Minitab plots response (Z) values at the x-y intersections of the grid, or mesh. If your x- and y- values are not evenly spaced, Minitab must interpolate (estimate) the z-values at the intersections of a regular mesh with the same x- and y-ranges as your data. For more information, go to Working with mesh on contour plots and 3D graphs.
The sample data should be selected randomly
In statistics, random samples are used to make generalizations, or inferences, about a population. If your data were not collected randomly, your results may not represent the population.
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