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ps2-questions - Middle East Technical University Faculty of...

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Middle East Technical University Faculty of Economics and Administrative Sciences Department of Economics Econ 206 – Spring 2008 PROBLEM SET # 2 1) A process produces bags of refined sugar. The weights of the contents of these bags are normally distributed with standard deviation 1.2 ounces. The content of a random sample of twenty-five bags had mean weight 19.8 ounces. Find a 95% confidence interval for the true mean weight for all bags of sugar produced by the process. 2) The cloze readability procedure is designed to measure the effectiveness of a written communication. Research has indicated that a score of 57% or more on the cloze test demonstrates adequate understandability of the written material. A random sample of 352 certified public accountants was asked to read financial report messages. The sample mean cloze score was 60.41 %, and the sample standard deviation was 11.28 %. Find a 95% confidence interval for the population mean score. 3) In a batch chemical process used for etching printed circuit boards, two different catalysts
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