In a survey of recent smart phone buyers, 120 of 150 randomly selected Nokia buyers said they would “highly recommend” the phone to a friend, while 146 of 200 randomly selected Samsung buyers said the same about their phone. Are theses sample results sufficient to reject a “no difference” null hypothesis at the 5% significance level?
Answer to relevant QuestionsIn a recent poll of 1000 randomly selected residents of eastern Germany and 1200 randomly selected residents of western Germany, 63% of the eastern Germany sample and 55% of the western Germany sample believed that they were ...In a study of alternative office layouts, Pro World Properties, a large international realty company, chose 12 of its local offices to test the impact of two different layouts on those working in the offices. The offices ...For small sample cases where we are testing the difference between two population means, when the population standard deviations are unknown, we used an approach in which we assumed that the two population standard ...Refer to Exercise 4 (employee turnover rate), where the least squares line is ˆy =139.2 6.7x. a. Report the SSE and s y. x values. b. Tell what these measures represent. Compute and interpret the r2 and r values for the regression analysis described in Exercise 4 (employee turnover).
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