2. Choosing the appropriate null hypothesis Aa Aa Socially isolated adults display high rates of mortality even after accounting for self-reports of physical health, socioeconomic status, and risk factors such as smoking, alcohol consumption, obesity, low physical activity, and use of preventive health services. John Cacioppo was interested in possible mechanisms by which loneliness may have deleterious effects on health. He compared the sleep quality of lonely and nonlonely people. Cacioppo did not predict direction. Identify the research design of this study: hypothesis test for a mean with known o Identify the appropriate null hypothesis for independent samples hypothesis test for a proportion matched sample2. Choosing the appropriate null hypothesis Aa Aa Socially isolated adults display high rates of mortality even after accounting for self-reports of physical health, socioeconomic status, and risk factors such as smoking, alcohol consumption, obesity, low physical activity, and use of preventive health services. John Cacioppo was interested in possible mechanisms by which loneliness may have deleterious effects on health. He compared the sleep quality of lonely and nonlonely people. Cacioppo did not predict direction. Identify the research design of this study: Identify the appropriate null hypothesis for this research design: Ho: HD = 0 Ho: U = 0 Ho: H1 - H2 = 0 Ho: H1 - H2 + 0