OSU BUSMGT 2320 - Recitation Practice Problems Week #5 Autumn 2014 (4 pages)

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Recitation Practice Problems Week #5 Autumn 2014



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Recitation Practice Problems Week #5 Autumn 2014

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Pages:
4
School:
Ohio State University
Course:
Busmgt 2320 - Decision Sciences: Statistical Techniques

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Recitation Practice Problems Week 5 Autumn 2014 1 According to one survey Compaq computers hold 8 of the laptop notebook computer market Suppose Compaq executives believe this figure is too low To test this they conduct a survey Of the two hundred respondents who own a laptop notebook computer twenty four own a Compaq Answer the following questions assuming a significance level of 0 05 is used a Write the hypotheses b What is are the critical p hat value s c What is the value of the test statistic d What is the P value for the test e What conclusion do you draw from this test f If they use a sample size of 200 what power will their test have to detect that the market share is higher than 8 when it is in fact 12 g What sample size is needed to ensure a power of 0 85 when market share is 12 if the significance level remains at 0 05 Recitation Practice Problems Week 5 Autumn 2014 2 A suitcase is manufactured using a certain strengthening process called Process A Another suitcase equivalent to the first in terms of function and capacity is manufactured using a new strengthening process called Process B Ten overseas tour guides are randomly selected and each is given a suitcase manufactured from each of the two processes After six months the manufacturer obtains the opinions from each of the tour guides as to the relative durability of each case rated on a scale of 1 to 10 The data is shown below Estimate the average difference in ratings given by the guides for the Process A and Process B suitcases with a 95 confidence interval Is it reasonable to conclude that the two processes are perceived by the tour guides as producing an equivalent product Let 0 05 Di 1 2 0 2 2 1 0 2 2 3 Di Conf Intervals One Sample Sample Size Sample Mean Sample Std Dev Confidence Level Mean Degrees of Freedom Lower Limit Upper Limit Data Set 1 10 0 900 1 595 95 0 9 2 041 0 241 Q Q Normal Plot of Difference Data Set 1 3 5 2 5 Standardized Q Value Guide Process A Process B 1 8 9 2 5 7 3 6 6 4 2 4



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