Prices for vitamins and other health supplements increased over the past several years, and the prices charged by different retail outlets often vary a great deal. The following data show the prices for 13 products at four retail outlets in Rochester, New York (Democrat and Chronicle, February 13, 2005).

Use α = .05 to test for any significant difference in the mean price for the four retail outlets.

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Item CVS K 8.49 9.49 2.66 6.19 7.69 2.19 8.99 7.49 9.99 3.59 2.99 4.69 2.66 Rite-Ald Wegmans Caltrate +D (600 mg/60 tablets) Centrum (130 tablets) Cod liver oil (100 gel tablets) Fish oi (1,000 mg/60 tablets) Flintstones Children's (60 tablets) Folic acid (400 mcg/250 tablets) One-a-Day Maximum (100 tablets) One-a-Day Scooby (50 tablets) Poly-Vi-Sol (drops, 50 ml) Vitamin B-12 (100 mcg/100 tablets) Vitamin C (500 mg/100 tablets) Vitamin E (200 IU/100 tablets) Zinc (50 mg/100 tablets) 5.99 9.47 2.59 4.99 5.99 2.49 7.49 5.99 8.49 1.99 2.49 3.49 2.59 7.99 9.89 1.99 4.99 5.99 3.74 6.99 6.49 9.99 1.99 1.99 2.99 3.99 5.99 2.69 5.99 6.29 2.69 6.99 5.47 8.37 1.79 2.39 3.29 2.79