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25 Cards in this Set
- Front
- Back
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biased sample
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a sample that reflects only certain aspects of a population. it is not representative of the entire population
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continuous variable
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a quantitative variable whose values fall at any point along an unbroken numerical scale of values
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correlational study
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a method of data collecting in which two or more operationally defined dependent variables are measured to see if they are related in a systematic fashion
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dependent measures
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obtained measures of the characteristics of interest in an experiment and a correlational study.
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dependent/related samples
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samples selected in such a way that assignment to one sample directly determines which member will be assigned to another sample.
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dependent variable
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characteristic of interest
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discrete variable
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a quantitative variable whose values fall only at particular points along a scale
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independent variable
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assignment to one sample in no way affects how members are assigned to another sample
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interval scale
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units are equally dispersed throughout and each unit represents an equal amount of the characteristic being measured
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levels
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an investigator's manipulation of the independent variables in an experiment
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nominal scale
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numerical notation that places a characteristic of interest into s specific category
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operational definition
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measurements used to identify the term in such a way that the definition of the term is clear
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ordinal scale
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numerical notation in which a number represents the amount of a particular characteristic
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qualitative variable
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having no consistent numerically identifiable characteristics that represent distinct events.
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quantitative variable
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defined on the basis of a measurable numerical value
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random sample
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one selected in such a way that every member of a given population has an equal chance of being selected and that every possible sample of the same size has the same chance of being selected
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randomization
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procedure by which member of a limited pool are randomly assigned without replacement to different samples
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randomized scales
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samples formed when a limited pool is divided in such a way that
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ratio scale
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contains an underlying quantitative dimension divided into equal units with an absolute 0 point
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real limits
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the values 1/2 the unit above and 1/2 the unit below
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research hypothesis
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describes the relationship between the variables of interest that can be tested
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sampling with replacement
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each selected member of the population is placed back into the population before the next member is selected
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sampling without replacement
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once a member has been selected for the sample, it is removed from the population.
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X
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represents the individual values of a set of dependent measures
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Y
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represents the individual values of a second set of dependent measures
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