Term
| Sampling is usually found in what section? |
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| Process of selecting representative units of a population for study |
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| Well defined set with specific properties. May be humans, medical records, specimens |
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| The entire set of cases about which the researcher would like to make generalizations |
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| The available population that meets the criteria |
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| Also known as eligibility criteria |
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| These determine the subjects used in a study by defining the criteria used to include or exclude a subject from a study. Must be explained by the researcher. Control for extraneous variables or bias |
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| Inclusion/exclusion criteria |
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| When might we use the whole population?? |
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| When the population size is very small; studying something very specific, rare disease |
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| A set of units (or people) that make up the population |
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| The purpose of sampling is to be more _____ not cost effective or even feasible to study an entire population |
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| The sample should be ____ or has the same key characteristics of the entire population |
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| This type of sampling uses randomizxation to choose units. More generalizable, representative. |
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| This type of sampling in a group is not random, less generalizble, less representative |
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What type of sampling are the following?
Convenience, quota, purposive |
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What type of sampling are the following?
simple random, stratified random, cluster |
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| When we assign randomly to a group it is known as what? |
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| When we select from the population randomly this is what? |
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| This type of sampling uses the most readily accessible persons or objects as subjects |
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Definition
| Convenience; non-probability |
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| The risk of bias is greatest in this type of sample |
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Definition
| Convenience; non-probability |
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| This tries to strengthen a convenience ssample. Ex. once I get 80 men in a survey and 120 women I've met my quota. (men 40%, women 60% chocolate buyers) |
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| Quota sample; non-probability |
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Term
Name the type of sample:
knowledge about characteristics of the population of interest is used to build representativeness into the sample. Identifies the strata of the population and proportionally represents the strata in the sample |
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Name the type of sample:
the researcher selects subjects who are considered to be typical of the population. Useful in studying pop. with unusual/rare characteristics. Not objective |
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| Purposive; non-probability |
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Critiquing convenience samples:
what motivated some people to participate and others not to participate? |
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Term
| With convenience samples, we are concerned with how _____ it is of the population |
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Name the type of sample:
uses random selection. each person has equal and independent chance of being included in the sample |
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| In probability sampling, each person has an ___ and ____ chance of being included in the sample |
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Name the type of sample:
define the population, list all units of the population, select sample of units from the sample will be chosen |
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| All the units of the population are known as the what? |
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| The greater the size of the sample, the greater _____ |
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| What is the disadvantage to simple random sampling? |
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Name the type of sample:
The population is divided into strata or subgroups that are homogeneous. |
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| Stratified random sampling |
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Name the type of sample:
RN population group: strata are BSN, ADN, diploma. Representativeness is maxamized |
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Definition
| Stratified random sampling |
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Name the type of sample:
At every stage there is randomization. Random sampling of units that progress from large to small. |
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Definition
| Multistage cluster sampling |
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| There are more sampling ____ with multistage cluster sampling |
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| There are more sampling ____ with multistage cluster sampling |
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| Sampling strategy: Can either be probability or non-prob. Subjects matched on fall risk and then randomly assigned to intervention or control. |
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| Sampling strategy: Exposed to drugs and no drug exposer. Followed birth to 15 YO |
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| Matching; non-experiemental design |
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| Sampling Strategy: Each subject gives names of others. Cyberbullying interviewed, person recommedns others who could participate |
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| The formulat for estimating the optimum sample size is called |
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| The ____ ____ looks for the optimal use of resources in a study |
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| The _____ should include demographics, inclusion/exclusion, sampling strategy, screening/recruit/protocol |
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| What are the threats to internal validity when sampling? |
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