Jnit 3 Chapter 9: Lesson 9.5 Assignment icore: 0.1m 0/8 answered OQuestiona v In 2006, 15% of all live births in the United States were to mothers under 20 years of age. A sociologist claims that births to mothers under 20 years of age is decreasing. The sociologist conducts a simple random sample of 49 births and finds that 5 of them were to mothers under 20 years of age. Test the sociologists claim at the o: = 0.05 level of significance. Preliminary: a. Is it safe to assume that n S 5 % of all mothers under 20 years of age in the United States? No Yes b. Verify np(1 p) 3 10. Round your answer to one decimal place. tott) = :1 c. Since np(1 p)