A production manager of a computer supplier company claims that circuit board Model C20- 8 produced by the company has a failure rate of 30% on a thermal cycling test. The thermal cycling test is known to cause failures in boards with weak circuit connections. Given that a 97% condence interval for the true percentage for the failure of circuit boards is (0.1814,0.2986). i) Calculate the estimation error made in estimating the true percentage for the failure of circuit boards using the given condence interval. [2 Marks] ii) Use condence interval approach to test the production manager's claim. [4 Marks]