Suppose, for a random sample of 200 firms that revalued their fixed assets, the mean ratio of debt t
Question: In a random sample of 120 large retailers, 85 used regression as a method of forecasting. In an independent sample of 163 small retailers, 78 used regression as a method of forecasting. Is it possible to say with 98% confidence that the proportion of retailers that use regression for forecasting is higher among large retailers that among small retailers?
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[Solution] We have the following data: n = 200, X̄=1045, s = 85. The claim is μ =1002. The sample data a #4377
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