how do i go about#25? i can send the ANOVA table if necessary

MLR Summary of Fit Problems 19-24: In a recent experiment to determine the factors affecting tensile strength of steel plates, the RSquare 0.86221 tensile strength (in kg/mm?), the manganese content (in parts per thousand), and the thickness (in mm) were RSquare Adj 0.845999 measured in a random sample of 20 plates. Root Mean Square Error 0.822761 Mean of Response 48.525 Observations (or Sum Wgts) 20 25 Construct and interpret the 95% confidence limit for the standard deviation of tensile strength of steel I Analysis of Variance plates for any fixed manganese content and thickness. Sum of Source DF Squares Mean Square F Ratio Model 2 72.009591 36.0048 53.1879 Error 17 11.507909 0.6769 Prob > F C Total 19 83.517500 40001 I Parameter Estimates Term Estimate Std Error t Ratio Prob> It] Intercept 26.640804 2.723354 9.78 40001 Manganese 3.3201132 0.331976 10.00 <.0007 thickness given ssw="2948.8" and tss="14990.8," finish filling in the anova table below: source df ss ms f between groups within total>