Find the equation of the tangent plane to the given surface at the specified point. 
Definitions:
Normally Distributed
A type of statistical distribution where the data tends to cluster around a central mean, with a symmetrical spreading outwards, resembling a bell-shaped curve.
Sample Size
The number of observations or items selected from a population to participate in a statistical analysis.
Correlation Coefficient
A rephrased definition from KT-15: A numerical index ranging from -1 to 1 that indicates the extent to which two variables have a linear relationship.
Interval Variables
Another term for interval data, indicating variables measured along a scale on which each point is placed at equal distance from one another, with meaningful quantifiable differences but without a true zero.
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