(a) Explain the "fundamental problem of causal inference." Using all of the potential outcomes in the table what is the average treatment effect?
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- When randomizing people to the intervention v. control group in the context of a randomized controlled trial, you should: Choose to enroll the people who are most likely to comply with your study protocol into the intervention group to avoid the problem of people not following through with the prescribed treatment you wish to study and thus lowering your chances of detecting an effect. Allow people to give their informed consent to participate in your study after they find out whether they have been randomized to one of the groups (either intervention or control), so that people who have doubts about any potential risks can make an informed choice about their participation after knowing what group they will be in. Make sure that you are aware of which people are in the intervention group and which are in the control group so that you can tailor your research questions to their groups. All of the above None of the aboveIn a study of schizophrenia (a mental disorder including disorganization of thought and withdrawal from reality), researchers looked at the prevalence of the disorder in the biological and adoptive parents of people who were adopted as children; they found the following results: Prevalence of schizophrenia Adoptees With schizophrenia Biological parents Adoptive parents 12 2 Without schizophrenia 6 4 [Source: S. S. Kety et al., 1978, in The Nature of Schizophrenia: New Approaches to Research and Treatment, L. C. Wynne, R. L. Cromwell, and S. Matthysse, Eds. New York: Wiley, 1978, pp. 25-37.] What can you conclude from these results concerning the role of genetics in schizophrenia? Explain your reasoning.Consider a study designed to estimate the role that certain characteristics play on predicting persons who are at greatest risk of developing arthritis in one or more joints. The authors have noted a lost-to-followup rate of 26%. Why is this cause for concern? It is cause for concern because those who remain in the study may be at a systematically higher risk than those not followed It is not cause for concern in this type of study; the concern exists only for randomized trials It is cause for concern because those who remain in the study may be at a systematically higher or lower risk than those not followed It is cause for concern because those who remain in the study may be at a systematically lower risk than those not followed
- 1)The Conceptual Model of Race by LaViest (1994), proposes a model with three pathways from race, to race differences in health status. Describe one (1) of these pathways from beginning to end. 2) Explain how race differences in diabetes prevalence could arise for the group described in American Indian / Alaska Native adults using the pathway in above question?True or false? The goal of randomization in RCTs is to make the treatment and control groups similar on all factors except the exposure. True FalseWhat is regression? How is it used?
- For each of the following phenomena, indicate (1) a possible hypothesis to ex- plain it, (2) a possible competing hypothesis, and (3) a test implication for each hypothesis. . In stressful situations, women appear to adapt better and quicker to the emotional demands of the situation than men do. The mosquito population in the county has decreased drastically in the past year even though county workers have curtailed the use of insecti- cides and have stopped urging residents to get rid of standing water on their property, which is a breeding ground for the insects.A correlation between two variables implies that ... one variable may or may not directly affect the other variable. the variables have a linear relationship. one of the variables is the independent variable and the other is the dependent variable. one variable directly affects the other variable.A hypothetical population of 3000 elderly adults was recruited for a 10-year study of Alzheimer's disease. Upon initial exam prior to the start of follow-up, 450 cases of the disease were diagnosed and excluded from further study. Over the 10-year study period, 640 new cases of Alzheimer's disease developed, and 215 of those incident cases died from the disease. The study participants contributed a total of 18,500 person-years of follow-up time. Calculate the Alzheimer's disease incidence rate per 1000 population during this study. Round to the nearest whole number. Include only the numerical answer (no units) in the answer box.
- Was the control group valid in the Tuskegee study? Why yes or why not? Can you please help me with this questionDiscuss which are the elements of the protocol for implementing a questionnaire data collection method. Elaborate a strategy for questionnaire design addressing the research question: "Does COVID-19 affect the work satisfaction of employees?". Propose four main questions that are suitable in your view to be part of this questionnaire. Briefly motivate your choice of questions and the strategy for the question-design that you have used.What is the primary reason for randomizing group allocation in a randomized controlled trial (RCT)? Question 3 options: to create treatment and control groups of equal size to blind participants to their group allocation to evenly distribute known and unknown factors that may affect the outcome between groups to increase the treatment effect between intervention and control groups