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# TSHPS PsychStat

### TSHPS Psychology's Statistics Terms

Frequency Distribution A List of scores ordered (often) from lowest to highest.
Histogram Graphed frequency distribution.
The "normal score." Center of a frequency distribution.
Mean The mathematical average of a distribution, obtained by adding the scores and then dividing by the number of scores.
Median The middle score in a ranked distribution: half the scores are above it, and half are below it.
Mode The most frequently occurring score or scores in a distribution.
Normal Distribution The frequency distribution is shaped like a symmetrical bell, with median, mode, and mean all at the peak.
Skewed Distribution A distribution that is distorted or skewed.
Negative Skew Tail on left, more data on the right than in normal curve, mean skewed to left or lower values.
Positive Skew Tail on right. More data on the left than in normal curve. Mean skewed to the right or higher values.
Range Difference between the highest and lowest scores in a distribution.
Standard Deviation Computed measure of how much scores vary around the mean score of a distribution.
1 Standard Deviation on Normal Curve 34% of scores.
Within 1 SD on NC 68% of scores .
2 SD on NC 47.5% of scores.
Within 2 SD on NC 95% of scores.
3 SD on NC 49.5% of scores.
Within 3 SD on NC 99% of scores.
Percentages Comparative statistic that compares a score to perfect score of 100 points.
Percentile Rank Comparative statistic that compares a score to other scores in an imaginary group of 100 individuals.
Inferential Statistics Statistics that can be used to make a decision or reach a conclusion about data.
T-Test A Test that compares the means of 2 groups.
Anova Test A Test that compares the means of 3 or more groups.
Statistical Significance A statement of likelihood that the difference occurred by chance (p value). Psychology studies must be less than 5% probability of difference occurring by chance.
Created by: ambooth
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