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16 Cards in this Set
- Front
- Back
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Define sampling |
A procedure for selecting sample participants from the targeted population |
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Define population |
A group that is studied in a research |
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What are the three commonly used sampling methods? |
Simple random Stratified Cluster |
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Define simple random |
All potential participants (n) have an equal chance of being selected from the population (N) |
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Define stratified |
The population is divided into groups (based on similarities) called strata and then a sample (n) is selected from each group |
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Define cluster |
Members of a population are assigned to unique groups called clusters and then a sample is selected by randomization (simple random sampling) |
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Explain Multi-staged |
Uses a combination of more than one sampling method at different stages |
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Explain Systematic |
Uses randomization as the main component along with a known interval (k) that is used to select the other participants after the first one was selected |
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Explain quota |
A non-probability sampling method which samples a population via a group of people with similar traits or features, however, these persons are not randomly selected |
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What is the central limit theorem? |
States that if you have a population with mean and standard deviation and take a sufficiently large random sample from the population with replacement, then the distribution of the same 'mean' will be approximately normally DIST |
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What is a discrete variable? |
A discrete variable is a variable whose value is obtained by counting.Examples: number of students present number of red marbles in a jar number of heads when flipping three coins students’ grade level |
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What is a continuous variable? |
A continuous variable is a variable whose value is obtained by measuring.Examples: height of students in class weight of students in class time it takes to get to school distance traveled between classes |
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Define primary data |
Primary data refers to the first hand data gathered by the researcher himself. |
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Define secondary data |
Secondary data means data collected by someone else earlier |
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State sources of primary data |
-Surveys -Observations -Experiments -Questionnaire -Personal interview |
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State sources of secondary data |
-Government publications -Websites -Books -Journal articles -Internal records |
