statistics for business

Project Description:

hi,
i have a question posted in the following link
http://books.google.com.kw/books?id=7nhphqsa5egc&lpg=pa712&ots=gsrupjrx4c&dq=refer%20to%20part%20e.%20estimate%20with%2095%20confidence%20the%20mean%20operating%20margin&pg=pa708#v=onepage&q&f=false

pages 711-712
i have all data relate to question.

require:
solving questions on those pages
Skills Required:
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