Label the values of the categorical (i.e., qualitative) variables according to the following codes: For gender, 1 = Female and 2 = Male; for undergrad major, 1 = Psychology, 2 = Pre-med, 3 = Biology, 4 = Sociology, and 5 = Economics. Your instructor may ask you to fill in missing-value codes for any data that are missing (e.g., blank cell in the Excel spreadsheet).