A. According to the Centers for Disease Control and Prevention, the proportion of U.S. adult age 25 or older who smoke is 0.22. A researcher suspects that the rate is lower among U.S. adults 25 or older who have a bachelor's degree or higher educational level. 1. What is the null hypothesis in this case? A. The proportion of smokers among U.S. adults 25 or older who have a bachelor's degree or higher is less than 0.22. B. The proportion of smokers among U.S. adults 25 or older who have a bachelor's degree or higher is 0.22. C. There is no relationship between education and smoking habits. D. The proportion of smokers among U.S. adults 25 or older who have a bachelor's degree or higher is not 0.22. 2. What is the alternative hypothesis in this case? A The proportion of smokers among U.S. adults 25 or older who have a bachelor's degree or higher is less than 0.22. B. The proportion of smokers among U.S. adults 25 or older who have a bachelor's degree or higher is 0.22. C. There is no relationship between education and smoking habits. D. The proportion of smokers among U.S. adults 25 or older who have a bachelor's degree or higher is not 0.22. B. A study investigated whether there are differences between the mean IQ level of pcople who were reared by their biological parents and those who were reared by someone else. 3. What is the null hypothesis in this case? A. The mean IQ level of people who were reared by their biological parents is lower than the mean of those who were not. B. There is no difference between the mean IQ level of people who were reared by their biological parents and those who were not. C. There is a difference between the mean IQ level of people who were reared by their biological parents and those who were not. D. The mean IQ level of people who were reared by their biological parents is higher than the mean of those who were not. 4. What is the alternative hypothesis in this case? A. The mean 1Q level of people who were reared by their biological parents is lower than the mean of those who were not. B There is no difference between the mean IQ level of people who were reared by their hological parents and those who were not. C. There is a difference between the mean IQ level of people who were reared by their biological parents and those who were not. D. The mean 1Q level of people who were reared by their biological parents is higher than the mean of those who were not