onsumer Reports (January 2005) indicates that profit margins on extended warrantie nost products. In this exercise we consider a major electronics retailer that wishes to i extended warranties on digital cameras. Historically, 20 percent of digital camera custo varranty. To Increase this percentage, the retailer has decided to offer a new warranty Suppose that three months after starting to offer the new warranty, a random sample o out of 525 digital camera customers purchased the new warranty. Find a 95 percent co camera customers who have purchased the new warranty. Are we 95 percent confider answers to 3 decimal places.) The 95 percent confidence interval is

FINANCIAL ACCOUNTING
10th Edition
ISBN:9781259964947
Author:Libby
Publisher:Libby
Chapter1: Financial Statements And Business Decisions
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Consumer Reports (January 2005) indicates that profit margins on extended warranties are much greater than on the purchase of
most products. In this exercise we consider a major electronics retailer that wishes to increase the proportion of customers who buy
extended warranties on digital cameras. Historically, 20 percent of digital camera customers have purchased the retailer's extended
warranty. To increase this percentage, the retailer has decided to offer a new warranty that is less expensive and more comprehensive.
Suppose that three months after starting to offer the new warranty, a random sample of 525 customer sales invoices shows that 130
out of 525 digital camera customers purchased the new warranty. Find a 95 percent confidence interval for the proportion of all digital
camera customers who have purchased the new warranty. Are we 95 percent confident that this proportion exceeds 20? (Round your
answers to 3 decimal places.)
The 95 percent confidence interval is
Yes
the entire interval
is
above 0.20.
Transcribed Image Text:Consumer Reports (January 2005) indicates that profit margins on extended warranties are much greater than on the purchase of most products. In this exercise we consider a major electronics retailer that wishes to increase the proportion of customers who buy extended warranties on digital cameras. Historically, 20 percent of digital camera customers have purchased the retailer's extended warranty. To increase this percentage, the retailer has decided to offer a new warranty that is less expensive and more comprehensive. Suppose that three months after starting to offer the new warranty, a random sample of 525 customer sales invoices shows that 130 out of 525 digital camera customers purchased the new warranty. Find a 95 percent confidence interval for the proportion of all digital camera customers who have purchased the new warranty. Are we 95 percent confident that this proportion exceeds 20? (Round your answers to 3 decimal places.) The 95 percent confidence interval is Yes the entire interval is above 0.20.
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