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Stats Ch3 & 4
Stats Ch3
Term | Definition |
---|---|
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. |