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Drug Store News (September2002) provided data on annual pharmacy sales for the leading pharmacy retailers in the United States.The following data are annual sales in millions.
Retailer Sales Retailer SalesAhold USA $1700Medicine Shoppe $1757CVS 12700Rite-Aid 8637Eckerd 7739Safeway 2150Kmart 1863Walgreens 11660Kroger 3400Wal-Mart 7250
a. Show a stem-and-leaf display.b. Identify the annual sales levels for the smallest, medium, and largest drug retailers.c. What are the two largest drug retailers?
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What is the distinction between a one-sided and a two-sided hypothesis test in this problem?
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