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# Stats Ch3 & 4

### Stats Ch3

TermDefinition
Distribution The possible values of the variable sliced into equal-width bins and gives the number of values (or counts) falling into each bin
Histogram A chart using adjacent bars showing distribution of a quantitative variable where each bar represents the frequency of values falling into each bin.
Relative Histogram A chart using adjacent bars showing distribution of a quantitative variable where each bar represents the percent of values falling into each bin.
Gap A region of the distribution where there are no values
Stem-and-Leaf A display showing quantitative data values in a way that sketches the distribution of the data
Dotplot A graph that shows a dot for each data value
Shape A description stating modes, symmetry or skewness, and outliers or gaps
Center A typical value of a distribution such as the mean or median
Spread A numerical summary of how tightly the values are clustered around the center.
Mode A hump or pile in the shape of a distribution of a variable
Unimodal A distribution having one mode
Bimodal A distribution having two modes
Multimodal A distribution having more than two modes
Uniform A distribution in which the height of each value is approximately the same
Symmetric A distribution that has, roughly, a mirror image of the other side from the center
Tails A part of a distribution that has fewer values and typically trails off to an end
Skewed A distribution that is not symmetric and has a tail that stretches out further on one side than another
Outliers Extreme values that do not appear to be consistent with the rest of the data
Median The middle value with 50% of the data below and 50% of the data above
Range The difference between the maximum value and the minimum value
Quartile The numbers that signify the 25% ,50%, and 75% division of data and divide the data into four equal parts
Interquartile Range (IQR) The difference between the third and first quartiles
Percentile The value below which a given percentage of observations in a group of observations fall
5-Number Summary Minimum value, lower quartile, median, upper quartile, and maximum value.
Box Plot or Box and Whiskers Plot A display using the 5-Number summary where the quartiles and median form a central box and whiskers are formed by connecting extrema to their nearest quartile
Mean Represented by a bar above the variable found by the summation of the data points divided by the data count.
Created by: HowardGeometry