2. A One-Way ANOVA model is fit to compare the weights of 4 natural fiber fabrics of common dimensions. There were 15 replicates for each of the 4 fibers (cotton, linen, silk, and wool). The sample means and residuals sum of squares are given below. Compute Tukey's Honest Significant Difference (W), and identify which fibers differ significantly in their weight. Use R to find the critical value of the Studentized range distribution (see slide 22 of Lecture 11). yc = 14.9, yz = 18.9, Us = 9.9, yw = 20.1, SSW = 727