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April 24, 2014

Homework Help: Statistics

Posted by Ryan on Monday, July 8, 2013 at 11:39am.

In the Federal Trade Commission (FTC) \Price Check" study of electronic checkout scanners, the
FTC inspected 1,669 scanners at retail stores and supermarkets by scanning a sample of items at
each store and determining if the scanned price was accurate. The FTC gives a store a \passing
grade" if 98% or more of the items are priced accurately. Of the 1,669 stores in the study, 1,185
passed inspection.

a. Find a 90% con dence interval for the true proportion of retail stores and supermarkets with
electronic scanners that pass the FTC price-check test. Interpret your result.

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