Frequency Distributions Flashcards
It is an organized tabulation of the number of individuals located in each category on the scale of measurement.
Frequency Distribution
The column heading for the frequencies.
f
It measures the fraction of the total group that is associated with each score.
Proportion
These are proportions describe the frequency in relation to the total number.
Relative Frequencies
It can be included in a frequency distribution table by adding a column headed with %.
Percentages
A frequency distribution table presenting groups of scores rather than individual values.
Grouped Frequency Distribution Table
The groups or intervals in a grouped frequency distribution table.
Class Intervals
It appears that they form the upper and lower boundaries for the class interval.
Apparent Limits
2 types of Graphs
- Histograms
- Polygons
It is where you first list the numerical scores along the X-axis.
Histograms
A slight modification to the traditional histogram that produces a very easy to draw and it’s simple to understand.
Modified Histogram
A second option for graphing a distribution of numerical scores from an interval or ratio scale of measurement.
Polygon
It is essentially the same as a histogram, except that spaces are left between adjacent bars.
Bar Graphs
2 special feature for population distributions
- Relative Frequencies
- Smooth Curves
It is often obtained rather than the absolute frequency for each scores in a population.
Relative Frequencies
It is drawn when a population consists of numerical scores from an interval or a ratio scale.
Smooth Curves
3 characteristics of a distribution
- Shape
- Central Tendency
- Variability
It measures where the center of the distribution if located.
Central Tendency
It measures the degree to which the scores are spread over a wide range or are clustered together.
Variability
It is defined by an equation that prescribes the exact relationship between each X and Y value on the graph.
Shape
It is possible to draw a vertical line through the middle so that one side of the distribution is a mirror image of the other.
Symmetrical Distribution
The scores that tend to pile up toward one end of the scale and taper off gradually at the other end.
Skewed Distribution
The section where the scores taper off toward one end of a distribution.
Tail of the Distribution
A skewed distribution with the tail on the right-hand side.
Positively Skewed Distribution
The distribution if the tail points to the left.
Negatively Skewed Distribution
These are individual scores or X-values.
Raw Scores
It is defined as the percentage of individuals in the distribution with scores at or below the particular value.
Rank/Percentile Rank
It is when a score is identified by its percentile rank.
Percentile
A resulting values that represent the accumulation of individuals as you move up the scale.
Cumulative Frequencies
A resulting value that show the percentages of individuals who are accumulated as you move up the scale.
Cumulative Percentages
He presented a technique for organizing data that provides a simple alternative to a grouped frequency distribution table or graph.
John W. Turkey
This technique requires that each score be separated into 2 parts.
Stem and Leaf Display
The first digit(s).
Stem
The last digit .
Leaf
