3. Ophthalmic lens is used in optical device to enhance vision addressing the visual needs of the individual wearer. Two different polishing solutions can be used for polishing the ophthalmic lenses. 350 lenses were polished using the first polishing-solution, and of this number, 294 had no polishing-induced defects. Another 400 lenses were polished using the second polishing solution, and 74 lenses had polishing-induced defects. UTM Construct a 95% confidence interval on the difference of the proportion polishing- induced defects between the first and second polishing solutions. ii. Based on the result in part (i), is there any indication that both types of polishing OUTM OUTM solutions have different effect on the ophthalmic lens? Justify your answer. UTM UTM OUTM OUT” JTM UTM 1 OUTM OUTMª JTM UTM TM

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