Data file:sleep.sav.

Conduct a standard multiple regression to explore factors that impact on people's level of daytime sleepiness. For your dependent variable, use the Sleepiness and Associated Sensations Scale total score (totSAS). For independent variables, usesex,age, physical fitness rating (fitrate) and scores on the HADS Depression Scale (depress). Conduct a full analysis and report for this data. You may want to assess how much of the variance in total sleepiness scores is explained by the set of variables (check your R square value) as well as which of the variables make a unique significant contribution (check your beta values)?