Two different types of polishing solutions are being evaluated for possible use in a tumblepolish operation for manufacturing interocular lenses used in the human eye following cataract surgery. Three hundred lenses were tumblepolished using the rst polishing solution, and of this number 253 had no polishinginduced defects. Another 300 lenses were tumblepolished using the second polishing solution, and 196 lenses were satisfactory upon completion. Is there any reason to believe that the two polishing solutions differ? Use a = 0.01. What is the critical value