Please number each question and give a clear answer

• Describe ecological research design and tell how this research design is different than cross-sectional research design.
• Discuss two variables of ecological research design.
• What kind of research design measures incidence?
• What is the common statistical approach that helps epidemiologists to calculate incidence based on person on risk?
• Provide at least two assumptions of this statistical approach.
• Explain how confounding and bias are the same. If they are not, then describe how these two differ in epidemiology.
• Explain three major biases that can occur with study design and two confounding situations that can lead to misinterpretation of results.