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Week Four Problems

# Week Four Problems - Week Four Problems Narinder Schoeling...

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Week Four Problems Narinder Schoeling Ashford University – Online Campus BUS 308 Statistics for Managers Professor Jake Grandy November 7, 2009

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Week Four Problems A. Chapter 9 1. 9.8 a. Letting μ represent the mean composite satifacation 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 μ exceeds 42. : > H0 μ 42 verse : Hα μ 42 b. In the context of this situation, interpret making a Type I error; interpret making a Type II error. Type I: decide μ 42 when μ > 42 Type II: decide μ > 42 when μ 42 2. 9.50 How do we decide whether to uses a z test or a t test when testing a hypothesis about a population mean? When testing a hypothesis about a population mean using the normal distribution is called z tests. It requires that the true value of the population standard deviation σ is known. When testing a hypothesis of a population standard deviation and σ is unknown.
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Week Four Problems - Week Four Problems Narinder Schoeling...

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