Introductory Statistics Professor Bernardo brego Summary: Math 140 Introductory Statistics Professor Bernardo Ábrego Lecture 21 Sections 8.1 Discussion: Confidence Intervals D3. According to the 2000 U.S. Census, about 60% of Hispanics in the United States are of Mexican origin. Would it be reasonably likely in a survey of 40 randomly chosen Hispanics to find that 27 are of Mexican origin? Source: www.census.gov/prod/2001pubs/c2kbr01-3.pdf. D4. According to the 2000 U.S. Census, about 30% of people over age 85 are men. In a random sample of 40 people over age 85, would it be reasonably likely to get 60% who are men? Source: www.census.gov/prod/2001pubs/c2kbr01-10.pdf. D5. Suppose that in a random sample of 40 toddlers, 34 know what color Elmo is. What is the 95% confidence interval for the percentage of toddlers who know what color Elmo is? D6. Polls usually report a margin of error. Suppose a poll of 40 randomly selected statistics majors finds that 20 are female. The Collections: Mathematics