Quick-reference one-page guide to t-tests, F-tests, and control limit formulas for the plant office.
If $X$ is the vector of measured variables and $V$ is the variance-covariance matrix of measurements, we find the adjusted values $\hatX$ that minimize: Statistical Methods For Mineral Engineers
She arrived at the site with a battered field notebook and a laptop full of scripts. Her graduate assistant, Lin, a meticulous thinker who could coax patterns out of chaos, met her by the core shack. They unfolded sample logs into a patchwork of numbers: sixty cores, each cut into half-meter intervals, each interval carrying an assay. The raw histogram looked like the craggy skyline of a mountain range — peaks, troughs, and long, ragged tails. Quick-reference one-page guide to t-tests