An industrial engineer conjectures that a major difference between successful and unsuccessful companies is the percentage of
Question:
a. Do the data provide sufficient evidence that successful businesses have a lower percentage of their products returned by customers? Use α = .05.
b. Do the required conditions for applying your test in part (a) appear to be valid?
c. In order for the difference in percentage returns to have an economical impact, the difference must be at least 5%. Is there significant evidence that the percentage for successful businesses is at least 5% less that the percentage for unsuccessful businesses?
d. Estimate the difference in the percentages of returns for successful and unsuccessful businesses using a 95% confidence interval.
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Related Book For
An Introduction To Statistical Methods And Data Analysis
ISBN: 9781305465527
7th Edition
Authors: R. Lyman Ott, Micheal T. Longnecker
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