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U1L2: Data

Histograms, box-plots, and measures of central tendency

frequency an interval made up of data values in that interval
frequency table a table that groups a set of data values into intervals and shows the frequency for each interval
histogram a graph that can display data from a frequency table
cumulative frequency table a table that shows the number of data values that lie in or below a given interval
symmetric describes a graph consisting of two parts that are congruent to each other
skewed left(negative)/skewed right (positive) distributions with fewer observations on the left/right
bell-shaped when the graph of a data set creates a symmetric bell-shape
uniform when the observations in a set of data are equally spread across the range of the distribution
unimodal/bimodal distributions with one clear peak/two clear peaks
gap areas of a distribution where there are no observations
outlier an extreme value that differs greatly from the other observations
measures of central tendency measurements that summarize a data set
mean the sum of the data values divided by the total number of data values (the average)
median the middle value in a data set when the values are arranged in order
mode the data item that occurs most times
measure of dispersion a measurement that describes how spread out the values in a data set are
range the difference between the greatest and least values
quartiles values that divide into four equal parts
interquartile range the difference between the third and first quartiles
box-and-whisker plot a graph that summarizes a set of data by displaying it along a number line
Created by: arouson