=+15.7 ● Suppose that a random sample of size n 5 5 was selected from the vineyard properties for sale in Sonoma County, California, in each of three years. The following data are consistent with summary information on price per acre (in dollars, rounded to the nearest thousand) for disease-resistant grape vineyards in Sonoma County

(Wines and Vines, November 1999).

1996 30,000 34,000 36,000 38,000 40,000 1997 30,000 35,000 37,000 38,000 40,000 1998 40,000 41,000 43,000 44,000 50,000