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36 Cards in this Set

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*Frequency Distribution
an organized tabulation (table or graph)of the number of individuals located in each category on the scale measurement. (a regular frequency distribution contains all the possible values of X and is usually arrnged from highest (top) to lowest (bottom).
Grouped Frequency Distribution
scores are groped into intervals rather than listed as individual values.
Range
the difference between the highest and lowest scores.
Class Interval
a group of scores in a grouped frequency distribution.
Aparent Limits
the score values that appear as the lowest and highest score in an interval
Histogram
a graph showing a bar above each score or interval so that the (height/vertical) of the bar corresponds to the (frequency) and the (width/horizontal) extends to the real limits (values of the variable)
*used for ordinal. interval, or ratio data
*looks like bar graphs but the bars touch each other
Modified Histogram
consists of stacks of blocks with each block representing one interval
Bar Graph
height of bar correspondes with frequency (space left between bars)
Polygon
a graph that consisted of lines that connest a series of dots that are placed above each interval so the height of the dot correspondes with frequency
Relative Frequency (proportion,p)
frequency reported in terms of the total number of scores.
Relative Frequency Distribution
displays the proportional (not exact) relationship of X values.
Symmetrical Distribution
the left-handed side is a mirror image of the right-handed side
Skewed Distribution
the scores tend to pile up toward one end of the scale and taper off gradually at the other end
Positively Skewed Distribution
the scores pile up on the left side and taper off to the right.
Negatively Skewed Distribution
the scores pile up on the right side and taper off to the left
Tail(s) of distribution
a section on either side of a distribution where the frequency tapers down toward zero as the X values become more extreme
Percentile
a (score) that is described in terms of its percentile rank
Percentile Rank
a (percentage of individuals) with scores at or below the specific score
Cumulative Frequency (cf)
the (frequency of individuals) with scores at or below a specific score
Cumulative Percentage (c%)
the (percentage of individuals) with scores at or below a (particular point of distribution)
Interpolation
a mathematical procedure for (estimating a value) that is located (between two know values)
Stem and Leaf Display
a technique for (presenting a complete distribution of scores) in an (organized display) similar to a grouped frequency distribution table
Nominal and ordinal data are displayed using _________ not __________.
Bar graphs not Histograms
Central Tendency
a statistical measure where a single score defines the center of a distribution
Mean
the sum of the scores in a distribution divided by the number of scores
Weighted Mean
the sum of all the scores in more than one distribution divided by the TOTAL number if scores in the distribution
Median
the value that divides a distribution of scores exactly in half
Mode
1.the score or catagory that had the greatest frequency
2.the scores that have distinctly higher frequences
Major Mode
a score or category that has the absolute highest frequency
Minor Mode
a score or category that has a relatively high frequency
Bimodal Distribution
a distribution with two modes
Multimodal Distribution
a distribution with multiple modes
Symmetrical Distribution
a distribution where a graph of the distribution has a right-handed side that is a mirror image of the left-handed side
Skewed Distribution
a distribution where a graph of the distribution is not symmetrical
Positive Skew
a distribution where the graph of the distribution has a tail on the right side(+)
Negative Skew
a distribution where the graph of the distribution has a tail on the left side
(-)