b. A quality study was performed on the manufacture of integrated circuits. A sample of 1200 units revealed 86 non-conforming units. i. Compute the 98% confidence interval for the actual proportion of non- conforming units. ii. Using a 0.05 level of significance, test the hypothesis that the actual proportion of non-conforming units is 6% against the alternative hypothesis that the actual proportion is larger than 6%.

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