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1. Recall that ‚Ëœvery satisfied‚ customer gives the XYZ-Box video game system a rating that is at least 42. Suppose that the manufacturer of the XYZ-Box wishes to use the random sample of 65 satisfaction ratings to provide evidence supporting the claim that the mean composite satisfaction rating for the XYZ-Box exceeds 42. a. Letting ¯­ represent the mean composite satisfaction rating for the XYZ-Box, set up the null and alternative hypotheses needed if we wish to attempt to provide evidence supporting the claim that ¯­ exceeds 42. b. In the context of this situation, interpret making a Type I error; interpret making a Type II error. 2. How do we decide whether to use a z test or t test when testing a hypothesis about population mean? 3.A wholesaler has recently developed a computerized sales invoicing system. Prior to implementing this system, a manual system was used. The distribution of the number of errors per invoice for the manual system is a follows: Errors per invoice 0 1 2 3 More than 3 Percentage of errors 87% 8% 3% 1% 1% After implementation of the computerized system, a random sample of 500 invoices gives the following error distribution: Errors per invoice 0 1 2 3 More than 3 Number of invoices 479 10 8 2 1 a. Show that it is appropriate to carry out a chi-square test using these data. b. Use the following EXCEL output to determine whether the error percentages for the computerized system differ from those for the manual system at the .05 level of significance. What do you conclude? 4.In recent years major efforts have been made to standardize accounting practices in different countries; this is called harmonization. In an article in Accounting and Business Research, Emmanuel N. Emenyonu and Sidney J. Gray (1992) studied the extend to which accounting practices in France, Germany, and the United Kingdom Harmonized. a. Depreciation method is one of the accounting practices studied by Emenyonu and Gray. Three methods were considered ‚€œ the straight-line method (S), the declining balance method (D), and a combination of D & S (sometimes European firms start with the declining balance method and then switch over to the straight-line method when the figure derived from the straight line exceeds that from declining balance). The data in table 12.5 summarize the depreciation methods used by a sample of 78 French, German, and U.K. firms. Use these data and the MegaStat output to test the hypothesis that depreciation method is independent of a firm‚s location (country) at the .05 level of significance. Table 12.5 ‚€œ Depreciation Methods Used by a Sample of 78 firms Depreciation Methods France Germany UK Total A. Straight line (S) 15 0 25 40 B. Declining Ba (D) 1 1 1 3 C. (D&S) 10 25 0 35 Total Companies 26 26 26 78

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