Sucrose, ordinary table sugar, is probably the single most abundant pure organic chemical in the world and

Question:

Sucrose, ordinary table sugar, is probably the single most abundant pure organic chemical in the world and the one most widely known to non-chemists. Whether from sugar cane (20% by weight) or sugar beets (15% by weight), and whether raw or refined, common sugar is still sucrose. Fifteen U.S. sugar beet€“producing counties were randomly selected and their sucrose percentages recorded. Similarly, 12 U.S. sugar cane€“producing counties were randomly selected and their sucrose percentages recorded.

Find the 95% confidence interval for the difference between the mean sucrose percentage for all U.S. sugar beet€“producing counties and all U.S. sugar cane€“producing counties.