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31 Cards in this Set

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score obtained by observation or from an experiment
raw score
scores arranged from highest to lowest, including each score's frequency
simple frequency distribution
compilation of scores into equal-sized ranges (class intervals) plus frequencies within intervals
grouped frequency distribution
a range of scores in a grouped frequency distribution
class interval
the horizontal, or X, axis of a graph
abscissa
the vertical, or Y, axis
ordinate
frequency distribution graph of a quantitative variable with frequency pointws connected by lines
frequency polygon
frequency distribution graph of a quantitative variable with frequencies indicated by contigous vertical bars
histogram
graph of the frequency distribution of nominal or qualitative data
bar graph
a mathematically defined, theoretical distribution or an empirical distribution with a particular bell shape
normal distribution (normal curve)
asymmetrical distribution, may be + or -
skewed distribution
graph with a great preponderance of low scores
positive skew
graph with a great preponderance of large scores
negative skew
distribution with two modes
bimodal distribution
severely skewed distribution with mode at one extreme
J-curve
graph that shows the relationship between two variable with lines
line graph
a distribution in which all scores have the same frequency
rectangular distribution (uniform distribution)
graph of the frequency distribution of nominal or qualitative data
bar graph
descriptive statistics that indicate a typical or representative score
central tendency
characterized by having more than one value
variability
the arithmetic average the sum of the scores divided by the number of scores
mean
point that divides a distribution of scores into equal halves
median
score that occurs most frequently in a distribution
mode
mean calculated from samples with different N's
weighted mean
highest score minus the lowest score
range
range of scores that captures the middle 50% of a distribution
interquartile range
point below which a specified percentage of the distribution falls
percentile
descriptive measure of the dispersion of scores around the mean
standard deviation
raw score minus the mean of its distribution
deviation score
square of the standard deviation
sum of the squared deviations from the mean
sum of the squared deviations from the mean
sum of squares