The second homework assignment, posted on Github, is due on Monday, March 27 by 11:59pm ET.

The first problem explores various modeling scenarios, the second looks at cross-validation for polynomial regression, and the third involves fitting and interpreting a model of supermarket sales data. Details are in the file for each problem.

Your code and a brief report with your results are to be submitted electronically in one zipped (or tarball-ed) file through the CourseWorks site. All code should be contained in plain text files and should produce the exact results you provide in your writeup. Code should be written in bash / R and should not have complex dependencies on non-standard libraries. The report should simply present your answers to the questions in an organized format as either a plain text or pdf file. All work should be your own and done individually.