Question: Scanning errors at Wal-Mart. Refer to the National Institute for Standards and Technology (NIST) study of the accuracy of checkout scanners at Wal-Mart stores in California, Exercise 5.51 (p. 296). Recall that in a sample of 60 Wal-Mart stores, 52 violated the NIST scanner accuracy standard (Tampa Tribune, Nov. 22, 2005). You demonstrated in Exercise 5.51e that the conditions for a valid large-sample confidence interval for the true proportion of Wal-Mart stores in California that violate the NIST standard were not met. Determine the number of Wal-Mart stores that must be sampled in order to estimate the true proportion to within .05 with 90% confidence using the large-sample method.

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