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12 Cards in this Set
- Front
- Back
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Placebo Effects
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The fact that subjects' expectations can lead them to experience some change even though they receive an empty, fake, or ineffectual treatment.
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Random Assignment
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The constituion of groups in a study such that all subjects have an equeal chance of being assigned to any group or condition.
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Replication
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The repetition of a study to see whether the earlier results are duplicated.
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Sampling Bias
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A problem that occurs when a sample isn't representative of the population from which it is drawn.
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Statistical Significance
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The condition that exists when the probability that the observed findings are due to chance is very low.
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Variability
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The extent to which the scores in a data set tend to vary from each other and from the mean.
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Frequency Distribution
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An orderly arrangement of scores indicating the frequency of each score or group of scores.
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Frequency Polygon
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A line figure used to present data from a frequency distribution.
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Histogram
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A bar graph that presents data from a frequency distribution.
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Negatively Skewed Distribution
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A distribution in which most scores pile up at the high end of the scale.
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Positively Skewed Distribution
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A distribution in which scores pile up at the low end of the scale.
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Scatter Diagram
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A graph in which paired X and Y scores for each subject are plotted as single points.
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