IIII a D E AA 16. Conservation agents netted 250 large-mouth bass in a lake and determined how many were carrying parasites. Applying the Concepts 17. Happiness and Your Heart Is there an association between level of happiness and the risk of heart disease? Researchers studied 1739 people over a 10-year period and asked questions about their daily lives and the hassles they face. The researchers also determined which individuals in the study experienced any type of heart disease. After their analysis, they concluded that happy individuals are less likely to experience heart disease. Source: European Heart Journal 31 (9):1065-1070, February 2010. (a) What type of observational study is this? Explain. (b) What is the response variable? What is the explanatory variable? (c) In the report, the researchers stated that "the research team also hasn't ruled out that a common factor like genetics could be causing both the emotions and the heart disease.I Use the language introduced in this section to explain what this sentence means. 18. Daily Coffee Consumption Is there an association between daily coffee consumption and the occurrence of skin cancer? Researchers asked 93.676 women to disclose their coffee- drinking habits and also determined which of the women had nonmelanoma skin cancer. The researchers concluded that found that women wi study gained 9 poune or cohabitating men single men. (a) Why is this an ob observational stu (b) What is the respe explanatory varia (c) Identify some po (d) Can we conclude one to gain weigh 21. Midwives Resea a cross-sectional stuc cost of delivery for fi delivery scenarios: (1) Caseload midwif (2) Standard hospita (3) Private obstetric The results of the stu midwifery were vagi standard hospital bir In addition, the cost compared with $527 for private obstetric Source Sally K Track