A manufacturer wanted to evaluate how the paint uniformity on certain products is affected by surface processing procedures and worker's skill level. Worker's skill level is commonly categorized into four levels (factor W with levels W1, W2, W3, W4}, for each of which they recruited a worker. They randomly selected three surface processing procedures (factor P with levels P1, P2, P3) from a number of available ones in the industry. Combinations of surface processing procedures and workers were randomly assigned to the raw samples, with each combination assigned to 5 raw samples. After the surface processing and painting steps, an index of paint uniformity was measured for each sample product. The ANOVA table is below. Source g; SS MS F p-value l____BIQEE'?l_E~E'-? ______________________________________________________ l______2_ _____________________ 99159 ____________________ i: in\" _________ it? _________________ Q 9229 _____ W \"flier-3_29125_******H***03153 _____ Procedure*Worker639930***********_