10.49 [EX10-049] Approximately 95% of the sunflowers raised in the United States are grown in North Dakota, South Dakota, and Minnesota. To compare yield rates between North and South Dakota, 11 sunflower-producing counties were randomly selected from North Dakota and 14 sunflower-

producing counties were randomly selected from South Dakota. Their 2004 yields (in pounds per acre) follow.

N. Dakota 1012 780 711 805 1294 666 779 1099 1314 1358 920 S. Dakota 1101 1347 1520 1025 1462 1650 1903 1652 486 1144 1684 1530 1800 876 Source: http://www.usda.gov/nass/graphics/county04/data/sf04.csv Find the 95% confidence interval for the difference between the mean sunflower yield for all South Dakota sunflower-producing counties and all North Dakota sunflower-producing counties.

Assume normality.