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and 2005, 11 of the hips developed squeaking. (a) Calculate a lower confidence bound at the 95% confidence level for the true proportion of such hips that develop squeaking. (Round your answer to three decimal places.) 18 (b) Interpret the 95% confidence level used in (a). We are 95% confident that the true proportion of all such artificial hip recipients who experience squeaking is greater than the lower bound. We are 95% confident that the true proportion of all such artificial hip recipients who experience squeaking is less than the lower bound