D Question 1 3.33 pts The National Health and Nutrition Examination Survey is a long-term research program that uses random sampling methods to examine the health and nutrition among adults and children in the United States. One study of 2437 young adults (aged 18-25 years) found that 35% reported eating foods with added sugars (e.g., soda, brownies) at least 5 times per week. In addition to questions about food consumption, researchers asked questions about periodontal disease. The young adults who reported eating added sugars more than 5 times per week had a 73% higher risk of developing periodontal disease than did those who reported eating no added sugars, and the increase was statistically significant. Based on the study, is it reasonable to say that eating foods with added sugars causes periodontal problems? Explain your answer. [ Select ] . The researchers [ Select ] young adults to eat foods with added sugars a certain number of times per week. D Question 2 3.34 pts Does wearing red lipstick produce better tips for waitresses? To find out, Lexie wrote "Red" on 30 slips of paper and "Neutral" on 30 slips of paper, and mixed them well. Each time she got ready for work, she randomly selected one piece of paper to determine what lipstick color she would wear that day. The mean tip amount was $23 greater when she was wearing red lipstick, and the difference is statistically significant. What is the largest population to which we can generalize these results? All waitresses like Lexie with customers like those in the experiment. The waitresses in Lexie's town. All waitresses. All restaurant customers. D Question 3 3.33 pts In the 1960s, children entering the Willowbrook State School, an institution for the intellectually disabled on Staten Island in New York, were deliberately infected with hepatitis. The researchers argued that almost all children in the institution quickly became infected anyway. The studies showed for the first time that different strains of hepatitis existed. This finding contributed to the development of effective vaccines. Despite these valuable results, explain why this study was unethical. O The subjects did not know what was happening to them. The subjects were not old enough to understand the ramifications in any event. O The subjects were not able to give informed consent. This study occurred too long ago to be considered unethical.The researchers [5'39\"] V young adults to eat foods with added sugars a certain number of times per week. [Select] di not randomly sample randomly sampled randomly assigned did not randomly assign