The results below are based on a sample of 20 employees selected to study the relationship between income (Y, in $1,000) and four variables Age (X, in years) work experience (X2, in years), number of years of education ()(), and number of past jobs (X,). Find the lower end point in a 90% confidence interval for the charge in the mean salary in dollars, for a unit change in number of past jobs, assuming that the other predictors remain unchanged. Note that normality is assumed for the multiple regression model Standard Coeffient Error Intercept -9.611198 2.77982638 Age 1 327695 0. 1149193 Experience -0.106705 0.14265559 Educ 7311332 0.80324187 Pastjobs -0.504168 0.44771573