During a user acceptance test (UAT), the project manager creates UAT scripts so the testers better understand the product or service. The project manager writes the scripts based on user stories, which are best described as what

Least square fit to polynomial write a function leastsquarefit3pol that solves a linear system of equations to find a least squares fit of a third order polynomial to an experimental data set given as two row arrays. the function leastsquarefit3pol must explicitly solve a set of linear equations and cannot use polyfit. there should be no restriction on the size of the problem that can be solved.