Use the Manufacturing database from "Excel Databases. xls" on Blackboard. Use Excel to develop a multiple regression model to predict Cost of Materials by Number of Employees, Number of Production Workers, Value Added by Manufacture, New Capital Expenditures, and End-of-Year Inventories. Use Excel to perform a backward elimination regression analysis at a 5% level of significance. What is the test statistic of the independent variable that is dropped from the linear model in the first step. Write your answer as a number and round to 2 decimal places.