The U.S. Postal Service (USPS) has used optical character recognition (OCR) since the mid-1960s. In 1983 , USPS began deploying the technology to major post offices throughout the country (www.britannica.com). Suppose that in a random sample of 500 handwritten zip code digits, 466 were read correctly. a. Construct a 95 % confidence interval for the true proportion of correct digits that can be automatically read. b. What sample size is needed to reduce the margin of error to 1 % ? c. How would t

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