Approximately 95% of the sunflowers raised in the United States are grown in the states of North Dakota, South Dakota, and Minnesot
a. 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 Dakot
a. Their 2008 yields, in pounds per acre, are recorded below.

Find the 95% confidence interval for the difference between the mean sunflower yield for all North Dakota sunflower-producing counties and the mean sunflower yield for all South Dakota sunflower-producing counties. Assume normality of yield rates.

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N. Dakota 1296 1475 1573 1517 1242 1385 1128 1524 1644 1377 1270 S. Dakota 1551 890 1710 1960 1988 1861 1870 1110 1674 1100 1381 2167 1130 1280