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Stats - Chapter 3
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Terms in this set (26)
DISTRIBUTION
Used with quantitative variables to slice up possible values and put them into equal-width bins and gives the counts going into each bin
HISTOGRAM
Display used with quantitative that has adjacent bars for each bin
RELATIVE FREQUENCY HISTOGRAM
Uses the relative frequency of quantitative variables and places them into adjacent bars for each bin
GAP
A region of the distribution that has no values
STEM-AND-LEAF DISPLAY
Displays quantitative data values in a way that sketches the distribution
DOTPLOT
Display that graphs a dot for each case against a single axis
SHAPE
Must describe the type of modes, the symmetry or skewness, and the outliers or gaps.
CENTER
The mean or the median
SPREAD
The IQR or Standard Deviation
MODE
A hump or local high point
UNIMODAL
One mode (one hump)
BIMODAL
Two modes (two humps)
MULTIMODAL
More than one mode (multiple humps)
UNIFORM
Distribution that is relative flat (no modes or humps)
SYMMETRIC
When a distribution has two halves on opposite sides of the center that look like mirror images
TAILS
The part of the distribution that trails off on either side
SKEWED
If a distribution is not symmetric and there is a tail that goes off in one direction
OUTLIERS
Extreme values that don't appear to belong with the rest of the data
INTERQUARTILE RANGE
Q3 - Q1
PERCENTILE
The number that falls above the ith% of the data
5-NUMBER SUMMARY
Minimum, Q1, Median, Q3, Maximum
BOXPLOT
A display for the 5-Number Summary and outliers
MEAN
The average, paired with the Standard Deviation
RESISTANT
If outliers have small effect on the calculated summary
STANDARD DEVIATION
Reported with the mean, the square root of the variance
VARIANCE
The sum of the squared deviations from the mean
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