(1) Drinking A national health organization, concerned about drinking in middle school students, surveyed 220 randomly selected US 8th-grade students and found that 18 of them had had a drink of alcohol in the past month. (a) Verify that the sample is large enough to proceed (for the Central Limit Theorem to apply). (b) Find and interpret a 95% confidence interval for the proportion p of US 8th-grade students who drink alcohol (c) Give the best estimate for p and give the margin of error for the estimate