Tuesday
September 2, 2014

Homework Help: statistics

Posted by Sandy on Sunday, February 24, 2013 at 12:32am.

Accuracy of price scanners at Wal-Mart. The National Institute for Standards and Technology (NIST) mandates that for every 100 items scanned through the electronic checkout scanner at a retail store, no more than 2 should have an inaccurate price. A recent study of the accuracy of checkout scanners at Wal-Mart stores in California was conducted (Tampa Tribune, Nov. 22, 2005). At each of 60 randomly selected Wal-Mart stores, 100 random items were scanned. The researchers found that 52 of the 60 stores had more than 2 items that were inaccurately priced.

a. Give an estimate of p, the proportion of Wal-Mart stores in California that have more than 2 inaccurately priced items per 100 items scanned.

b. Construct a 95% confidence interval for p.

c. Give a practical interpretation of the interval, part b.

d. Suppose a Wal-Mart spokesperson claims that 99% of California Wal-Mart stores are in compliance with the NIST mandate on accuracy of price scanners. Comment on the believability of this claim.

e. Are the conditions required for a valid large-sample confidence interval for p satisfied in this application? If not, comment on the validity of the inference in part d.

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

statistics - Accuracy of price scanners at Wal-Mart. The National Institute for...
Statistics - In the Federal Trade Commission (FTC) \Price Check" study of ...
Statistics Help please - Is Scanner Accuracy the Same for Specials? In a study ...
Please help with Statistics - : Is Scanner Accuracy the Same for Specials? 176 ...
Help with statistics - In a study of store checkout scanning systems, samples of...
Pre-Calculus - Cost,Revenue,and Profit: Estimate the number of scanners that ...
Principles of Management - Answer questions 1 through 3 based on the following ...
Chem - The National Institute of Science and Technology (NIST) kinetics database...
INB 205 - Wal-Mart Taking on the World Minicase Thank you Ms Sue. Now I need to ...
financial analysis - Can someone help me understand how to remove the 'passive ...

Search
Members