Ch. 2 & Statistics of Psychology AP
Terms
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- Placebo Effects
- The fact that subjects' expectations can lead them to experience some change even though they receive an empty, fake, or ineffectual treatment.
- Random Assignment
- The constituion of groups in a study such that all subjects have an equeal chance of being assigned to any group or condition.
- Replication
- The repetition of a study to see whether the earlier results are duplicated.
- Sampling Bias
- A problem that occurs when a sample isn't representative of the population from which it is drawn.
- Statistical Significance
- The condition that exists when the probability that the observed findings are due to chance is very low.
- Variability
- The extent to which the scores in a data set tend to vary from each other and from the mean.
- Frequency Distribution
- An orderly arrangement of scores indicating the frequency of each score or group of scores.
- Frequency Polygon
- A line figure used to present data from a frequency distribution.
- Histogram
- A bar graph that presents data from a frequency distribution.
- Negatively Skewed Distribution
- A distribution in which most scores pile up at the high end of the scale.
- Positively Skewed Distribution
- A distribution in which scores pile up at the low end of the scale.
- Scatter Diagram
- A graph in which paired X and Y scores for each subject are plotted as single points.