Richard M.

Perfect SAT score / Vanderbilt University / Math + Econ

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Calculus

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Question:

A derivative of zero and a second derivative that is positive correspond to what?

Richard M.

Answer:

A minimum.

Econometrics

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Question:

What is the expectation of the product of an input variable and its corresponding residuals?

Richard M.

Answer:

Zero.

Statistics

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Question:

What is the Cramer-Rao Lower Bound?

Richard M.

Answer:

The minimum variance of an estimation of a parameter, inversely proportional to Fisher Information.. The variance of the variance is 2/n*var^2.

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