Census vs. Survey
A parameter is a numerical description of a population characteristic
A statistic is a numerical description of a sample characteristic
Characteristics of a Well-Designed and Well-Conducted Survey
- Must represent the population that you want to draw inference about
Does not introduce bias
What is it?
How might it occur?
Wording of the question
Under-coverage: miss a certain group of people
Non-response: someone in your sample choose not to respond
Simple Random Sample (SRS)
Random digit table
- MATH ➡️ PRB ➡️ randInt(lower, upper, number of numbers)
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- Stratified Random Sampling
Systematic Random Sample
If you wanted to select a sample of school children and you did this by selecting an SRS of classrooms this would be an example of what type of sampling?
If you wanted to select a sample of school children and you did this by randomly selecting 5 children from each grade this would be an example of what type of sampling?
- Selecting those that are easy of convenient
Voluntary Response Sample