I. Identifying the "subject" of your study
- What is the question? (What are my hypotheses?)- 1 slide
- Is the data obtainable? (birth weight, socio economic, drugs, alcohol)- 1 slide
- Is it ethical to obtain such data?
- If not, is there a reasonable substitute?
- Are the assumptions reasonable?- 1 slide
- Identify the population of interest- 1 slide
- Survey- several slides (how would you design the survey, you do not have to actually do the survey) * * * although, for extra credit (5 points) you can do a survey
- Obtain a representative sample of that population- 1 slide
- Simple Random Sampling
- Stratified Sampling (M-F, Age groups)
- Systematic Sampling (class roster, census list)
- Multi-Stage Sampling
- Sources of Bias- 1-2 slides
- Voluntary Response
- Non-response bias (day phone)
- Response bias (people lie)
- Undercoverage
- Obtain a representative sample of that population- 1 slide
- Observational Studies- 1-3 slides
- Used when a designed experiment is not ethical
- Subjects studied over a period of time in natural setting
- Case/Control – Control must match
- Record Variables of interest
- Confounding is a major issue
- Designing an Experiment1-5 slides
- Researcher has control over the subjects or units in the study
- An intervention takes place that otherwise would not occur
- Randomization used to assign treatments
- Strongest case for causality
- EDA – Exploratory Data Analysis (trends, relationships, differences) - optional, 1 slide
- Pilot Study
- Identify variables
- Identify types of variables
- Qualitative
- Quantitative
- Identify Limits of measurement or observation
- Use proper procedures and techniques.
- Check the assumptions behind the procedures and techniques.
- What are the answers to the original hypotheses?
- What are the limitations of the study?
- What conclusions does the study not make?
- What new questions arise from this study?
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