Question
Answer
Basic Sampling Concepts in Quantitative Studies
Eligibility Criteria
Question
Answer
Basic Sampling Concepts in Quantitative Studies
Question
Answer
Basic Sampling Concepts in Quantitative Studies (cont.)
Nonprobability Sampling
Probability Sampling
Power Analysis
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Category: mathematicsmathematics

Sampling in quantitative research

1.

Chapter 12
Sampling in Quantitative
Research
Copyright © 2012 Wolters Kluwer Health | Lippincott Williams & Wilkins

2. Question

Tell whether the following statement is true or false:
The aggregate of cases in which a researcher is
interested is called a sample.
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3. Answer

False
The aggregate of cases in which a researcher is
interested is called a population. A sample is
selection of a portion of the population to represent
the entire population.
Copyright © 2017 Wolters Kluwer Health | Lippincott Williams & Wilkins

4. Basic Sampling Concepts in Quantitative Studies

Population: the aggregate of cases in which a
researcher is interested
Sampling: selection of a portion of the population (a
sample) to represent the entire population
Element: basic population unit about which
information is collected
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5. Eligibility Criteria

• Establish population characteristics
• Determine participation in study
• Maximize construct validity
• Inclusion
• Exclusion
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6. Question

Tell whether the following statement is true or false:
Researchers usually sample from the target
population.
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7. Answer

False
Researchers usually sample from the accessible
population but should identify the target population
to which they want to generalize their results.
Copyright © 2017 Wolters Kluwer Health | Lippincott Williams & Wilkins

8. Basic Sampling Concepts in Quantitative Studies

Representative sample
A sample whose key characteristics closely
approximate those of the population
Sampling bias
The systematic over- or underrepresentation of
segments of the population on key variables
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9. Question

Tell whether the following statement is true or false:
Probability sampling involves random selection of
elements.
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10. Answer

True
Probability sampling involves random selection of
elements.
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11. Basic Sampling Concepts in Quantitative Studies (cont.)

Probability sampling
Involves random selection of elements
Nonprobability sampling
Does not involve selection of elements at random
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12. Nonprobability Sampling

• Convenience sampling
• Snowball sampling
• Quota sampling
• Consecutive sampling
• Purposive sampling
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13. Probability Sampling

• Simple random sampling
• Stratified random sampling
• Multistage sampling
• Cluster sampling
• Systematic sampling
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14. Power Analysis

• Estimate sample size
• Large samples preferred to small samples
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