A boot manufacturer is testing the quality of leather provided by a potential supplier. The manufacturer wants

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A boot manufacturer is testing the quality of leather provided by a potential supplier. The manufacturer wants to construct a two-sided confidence interval with a confidence level of 959? that has a length no larger than 0.1. and from previous experience it is believed that the variability in the leather is such that the standard deviation is no larger than 0.2031. What sample size would you recommend?
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