Calculate the 90% confidence interval for the following variables, comparing lower, working, middle, and upper classes (CLASS) in the GSS sample. Use the Explore procedure using CLASS as your factor variable (Analyze, Descriptive Statistics, Explore). Make a summary statement of your findings. (Make sure you reset Select Cases to All cases.) HRSRELAX (hours to relax per d EDUC (Respondent's highest year of school completed)HRS1 (work hours per week)MAEDUC (Mother's highest year of school completed)