An article in the Nov. 11, 2005, issue of the San
Chapter 8, Problem 72(choose chapter or problem)
An article in the Nov. 11, 2005, issue of the San LuisObispo Tribune reported that researchers making randompurchases at California Wal-Mart stores found scannerscoming up with the wrong price 8.3% of the time.Suppose this was based on 200 purchases. The NationalInstitute for Standards and Technology says that in thelong run at most two out of every 100 items should haveincorrectly scanned prices.a. Develop a test procedure with a significance level of(approximately) .05, and then carry out the test todecide whether the NIST benchmark is not satisfied.b. For the test procedure you employed in (a), what isthe probability of deciding that the NIST benchmarkhas been satisfied when in fact the mistake rate is 5%?
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