Displays of Data
This is an arrange of data from the highest value to lowest value.
What is an Array?
The most commonly occurring score
What is the Mode?
The degree to which individual data points are distributed around the mean.
What is the Variability?
Having the same shape on both sides of center
What is Symmetry?
A normal distribution with a mean equal to 0 and a variance equal to 1.
What is the Standard Normal (Curve) Distribution?
A distribution in which the values of the dependent variable are tabled or plotted against their frequency of occurrence
What is a Simple Frequency Distribution?
The sum of the scores divided by the number of scores
What is the Mean?
The highest score minus the lowest score.
What is the Range?
The number of meaningful peals in a frequency distribution of data.
What is Modality?
Symmetric, unimodal, with a horizontal asymptote at y=0.
What are the Characteristics of the Normal Curve?
A distribution grouped into class intervals
What is a Grouped Frequency Distribution?
The score corresponding to the point having 50% of the observations below it when observations are arranged in numerical order
What is the Median?
The range of the middle 50% of the observations
What is the Interquartile Range?
A measure of the degree to which a distribution is symmetrical
What is Skewness?
The number of standard deviation units above or below the mean.
What is the Z-Score?
A graphical display presenting original data arranged into a histogram.
What is a Stem-and-Leaf Display?
You cannot use this measure of central tendency with nominal or ordinal data sets.
What is the Mean?
The most accurate measure of variability.
What is the Variance?
An extreme point that stand out from the rest of the distribution
What is an Outlier?
The formula for z-score.
What is z=(x-mu)/sigma OR z=(x-xbar)/s?
A graph in which rectangles are used to represent frequencies of observations within each interval.
What is a Histogram?
The only valid measure of Nominal data.
What is the Mode?
A measure of the average deviations of each score from the mean.
What is the Standard Deviation?
A distribution that has two meaningful peaks
What is Bimodal?
Any area under the curve less than 50% of the distribution and includes 1 of the 2 tails.
What is the Smaller Portion?