Discussion Question

Discussion Question

1- Discussion question: Describe why you were to chose a specific method to select a sample over other methods. Defend the method you preferred.

2- APA Style

Chapter 13 Sampling in Quantitative Research

Copyright © 2017 Wolters Kluwer Health | Lippincott Williams & Wilkins

Copyright © 2021 Wolters Kluwer Health | Lippincott Williams & Wilkins

1

Question #1

Tell whether the following statement is true or false:

The aggregate of cases in which a researcher is interested is called a sample.

Copyright © 2021 Wolters Kluwer Health | Lippincott Williams & Wilkins

Answer to Question #1

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 © 2021 Wolters Kluwer Health | Lippincott Williams & Wilkins

Basic Sampling Concepts in Quantitative Studies #1

Population: the aggregate of cases in which a researcher is interested

Accessible population: the aggregate of cases that conform to designated criteria and that are accessible for a study

Target population: the aggregate of cases about which the researcher would like to generalize

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4

Basic Sampling Concepts in Quantitative Studies #2

Eligibility criteria/inclusive criteria: criteria that specify population characteristics

Cost

Practical constraints

People’s ability to participate

Design considerations

Exclusion criteria

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5

Basic Sampling Concepts in Quantitative Studies #3

Samples and Sampling

Sampling: selection of a portion of the population (a sample) to represent the entire population

Element: basic population unit about which information is collected

Sample: a subset of population elements

Representative sample

Probability sample

Nonprobability sample

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6

Question #2

Tell whether the following statement is true or false:

Researchers usually sample from the target population.

Copyright © 2021 Wolters Kluwer Health | Lippincott Williams & Wilkins

Answer to Question #2

False

Researchers usually sample from the accessible population but should identify the target population to which they want to generalize their results.

Copyright © 2021 Wolters Kluwer Health | Lippincott Williams & Wilkins

Basic Sampling Concepts in Quantitative Studies #4

Staged sample: samples are sometimes selected in multiple phases

Sampling bias: the systematic over- or underrepresentation of segments of the population on key variables

Copyright © 2021 Wolters Kluwer Health | Lippincott Williams & Wilkins

Question #3

Tell whether the following statement is true or false:

Probability sampling involves random selection of elements.

Copyright © 2021 Wolters Kluwer Health | Lippincott Williams & Wilkins

Answer to Question #3

True

Probability sampling involves random selection of elements.

Copyright © 2021 Wolters Kluwer Health | Lippincott Williams & Wilkins

Nonprobability Sampling

Convenience sampling

Snowball sampling

Quota sampling

Consecutive sampling

Purposive sampling

Evaluation of nonprobability sampling

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12

Probability Sampling

Simple random sampling

Stratified random sampling

Multistage sampling

Cluster sampling

Systematic sampling

Evaluation of probability sampling

Copyright © 2021 Wolters Kluwer Health | Lippincott Williams & Wilkins

13

Sample Size in Quantitative Studies

Power analysis

Estimate sample size

Large samples preferred to small samples

Sample size basics

Factors affecting sample size /requirements in quantitative research

Effect size

Homogeneity of the population

Cooperation and attrition

Subgroup analyses

Copyright © 2021 Wolters Kluwer Health | Lippincott Williams & Wilkins

14

Implementing a Quantitative Sampling Plan

Steps in sampling

Identify the population

Specify the eligibility criteria

Specify the sampling plan

Recruit the sample

Sample recruitment

Screening instrument

Generalizing from samples

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15

Critical Appraisal of Sampling Plans #1

Sampling Plan

Construct

Internal factors

External factors

Statistical conclusion validity

Copyright © 2021 Wolters Kluwer Health | Lippincott Williams & Wilkins

Critical Appraisal of Sampling Plans #2

Sampling plan should be scrutinized with respect to

Approach used

Study population and eligibility criteria

Number of participants and rationale for sample size

Inclusion of power analysis

Description of main characteristics of sample

Number and characteristics of participants who declined participation/dropped out

Copyright © 2021 Wolters Kluwer Health | Lippincott Williams & Wilkins

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