Follow these discussion guidelines:

• create an example of an experiment and an observational study. Next choose two sampling methods and create your own example of surveys using your sampling methods.

Example

Example of an experiment:

• Question: Is a new blood pressure medication effective?
• Study: Two hundred people with high blood pressure were randomly assigned to two groups. One group received a new blood pressure medication, and the other group received a placebo. After a period of time, blood pressure measurements were recorded for each group.

Example of an observational study:

• Question: What are the causes of heart disease?
• Study: Framingham Heart Study: 50 years of data involving thousands of Framingham residents is analyzed to determine which biologic and environmental problems led to heart disease and stroke. The study found that high cholesterol, high blood pressure, diabetes, and cigarette smoking lead to heart disease.

Example of a stratified sample:

To conduct a study on malpractice rates, subdivide doctors into four groupssurgeons, family practitioners, obstetricians, and others. Take a sample of doctors within each group.

Example of systematic sampling:

Select every 30th iPod from an assembly line to check for defects.

To show rubric, select the 3 vertical dots in the upper right corner.

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