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Definition
| the process of slecting a number of individuals for a study in such a way that individuals represent the larger group from which they were selected |
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Definition
| to gain info about a larger population |
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| Three questions to ask when considering sample |
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Definition
Are the research participants appropriate for the research question?
Are the research participants representative of the population of interest?
How many research participants should be used? |
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Definition
| refers to an entire group or aggrgate of people or elements having one or more common characteristics |
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Definition
| a small subgroup of a population of interest thought to be representative of that population |
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Definition
| the process of selecting a subgroup or sample of the population |
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Definition
| the accessible population or collection of elements from which the sample is actually drawn |
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| Purpose of Random selection |
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Definition
| to enable the researcher to generalize the results to a larger population |
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| Purpose of random assignment |
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Definition
| to enable the researcher to assume that groups are "equivalent" at the beginning of the study |
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Term
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Definition
Simple random sampling
Stratified random sampling
Systematic sampling
Cluster sampling |
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| Types of non random sampling |
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Definition
Purposive sampling
Convenience sampling |
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| With simple random sampling |
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Definition
| every member of the population has an equal probability of being selected for the sample |
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Term
| Stratified random sample is |
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Definition
| one obtained by separating the population elements into non-overlapping subgroups and then selecting a simple random sample from each strata |
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Definition
| the sampling units are selected in a series according to some predetermined sequence |
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Term
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Definition
| simple random sample in which each sampling unit is a collection or cluster of elements |
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Term
| In non random sam-pling the probability that a participant will be chosen is |
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Definition
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Term
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Definition
| members of the sample are purposively selected because they possess certain traits |
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Term
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Definition
| selecting research participants on the vasis of being accessible and convenient to the researcher |
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| Sampling for descriptive or correlational |
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Definition
| should have more research participants (more variable; less controlled; higher attrition) |
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| Sampling for experimental studies |
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Definition
| fewer research participants (less variable; more controlled; lower attrition) |
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Term
| Power of the statistical test |
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Definition
| the probability that the test will reject the null when the null is false |
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Definition
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Definition
| sample size will be larger |
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Definition
Availability of research participants
Costs
Time
Resources |
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Term
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Definition
| the extent to which the sample values deviate from those that would be obtained from the entire population because samples are not 100% representative of a population |
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