Statistics Ap Psychology
Negatively skewed
A distribution of scores in which scores are concentrated in the high end of the distribution
Normal curve
A special frequency polygon in which the scores are symmetrically distributed around the mean, and the mean,mode,median are all located on the same point on the curve with scores decreasing as the curve extends from the mean
Frequency distribution
A table or graph that shows how often different number or scores appear in a particular set of scores
Descriptive statistics
A way of organizing numbers and summarizing them so that patterns can be determined
Bell curve
Alternate name for the normal curve which is said to be shaped like a bell
Inferential statistics
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
Mean
Arithmetic average of a distribution of numbers
Histogram
Bar graph showing a frequency distribution
Statistics
Branch of mathematics concerned with the collection and interpretation of numerical data
Bimodal
Condition in which a distribution has two modes
Range
Difference between the highest and lowest scores in a distribution
Positively skewed
Distribution of scores in which scores are concentrated in the low end of the distribution
Skewed distribution
Frequency distribution in which most of the scores fall to one side or the other of the distribution
Bimodal distribution
Frequency distribution in which there are two high points rather than one
Sample
Group of subjects selected from larger population of subjects
Polygon
Line graph showing a frequency distribution
Statistic
Measure of a central tendency or variability computed from a sample
Measures of variability
Measurement of the degree of differences within a distribution or how the scores are spread out
Median
Middle score in an ordered distribution of scores
Mode
Most frequent score in a distribution of scores
Parameter
Number representing some measure of central tendency or variability neighing a population
Measure of central tendency
Numbers that best represent the most typical score of a frequency distribution
Standard deviation
Square root of the average squared deviations from the mean of the scores in a distribution