A fashion student was interested in factors that predicted the salaries of catwalk models. She collected data from 231 models. For each model she asked them their salary per day on days when they were working (salary), their age (age), how many years they had worked as a model (years), and then got a panel of experts from modelling agencies to rate the attractiveness of each model as a percentage with 100% being perfectly attrac- tive (beauty). The data are on the CD-ROM in the file Supermodel.sav. Unfortunately, this fashion student bought some substandard statistics text and so doesn't know how to analyse her data Can you help her out by conducting a multiple regression to see which factor predicts a model's salary? How valid is the regression model?2