Problem 1. Use calculus and some drawings to completely characterize the function z=f(x,y)=2x?y*, as we did in class with the function z=2x'y*. Here are some thoughts on how to proceed. a. Write out the first-order partial derivatives. b. Write out the second-order partial derivatives. c. Hold y constant and focus on the relationship between x and z. Draw a graph of the relationship between x and z, holding y constant.

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.