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Running head: WEEK 4 ASSIGNMENT

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Week 4 Assignment BUS308: Statistics for Managers Professor Name Date

9.13THE VIDEO GAME SATISFACTION RATING CASE


Running head: WEEK 4 ASSIGNMENT

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Recall that “very satisfied” customers give 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 rating to provide evidence supporting the claim that the mean composition satisfaction rating for the XYZ-Box exceeds 42. a. Letting � represents the mean composition satisfaction rating for the XYZ-Box, set up the null hypothesis Ho and the alternative hypothesis Ha needed if we wish to attempt to provide evidence supporting the claim that � exceeds 42. In order to support the claim that � exceeds 42 the null and alternative claim hypothesis is: Null Ho: � ≤ 42 Alternative Ha: � > 42 b. The random sample of 65 satisfaction ratings yields a sample mean of � ̅ = 42.954. Assuming that o equals 2.64, use critical values to test Ho verses Ha at each of a = .10, .05, .1 and .001. By applying the z test statistic formula of:

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Bus 308 week 4 assignments problems 9 13, 9 22, 12 10, 12 18(a)  
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