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AP Psych Set Two
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Key Concepts:
Terms in this set (23)
Descriptive Statistics
A way of organizing numbers and summarizing them so that patterns can be determined
Inferential Statistics
Statistical analysis of two or more sets of numerical data to reduce the possibility of error in measurement and to determine if the differences between the data sets are greater than chance variation would predict
Parameter
A number representing some measure of central tendency or variability within a population
Frequency Distribution
A table or graph that shows how often different numbers or scores appear in a particular set of scores
Histogram
A bar graph showing a frequency distribution
Polygon
Line graph showing a frequency distribution
Normal Curve/ Bell Curve
A special frequency polygon in which the scores are symmetrically distributed around the mean, and the mean, median, mode are all located on the same point on the curve with scores decreasing as curve extends
Negatively Skewed
A distribution of scores in which scores are concentrated in the high end of the distribution
Positively Skewed
A distribution of scores in which scores are concentrated in the low end of the distribution
Bimodal Distributions
Frequency distribution in which there are two highpoint rather than one
Measure of Central Tendency
Numbers that best represent the most typical score of a frequency distribution
Mean
The arithmetic average of a distribution of numbers
Median
The middle score in an ordered distribution of scores, or the mean of the two middle numbers; the 50th percentile
Mode
The most frequent score in a distribution of scores
Measures of Variability
Measurement of the degree of differences within a distribution or how the scores are spread out
Range
The difference between the highest and lowest scores in a distribution
Standard Deviation
The square root of the average square deviations from the mean of scores in a distribution
Statistical Significance
Referring to differences in data sets that are larger than chance variation would predict
Z Score
A statistical measure that indicates how far away from the mean a particular score is in terms of the number of standard deviations that exist between the mean and the scores
T Test
Type of inferential statistical analysis typically used when two means are compared to see if they are significantly different
F Test
Analysis of variance, determines if 3+ means are different from each other
Chi-Square
Compares frequencies of proportions between groups to see if they are different
Correlation Coefficient
A number that represents the strength and direction of a relationship existing between two variables
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