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21 Cards in this Set
- Front
- Back
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Measure of central tendency |
a single value that can be used to represent all the other values in the collection |
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Center |
this measure tells us where the ________ of the distribution lies |
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Arithmetic mean |
sum of all the values in the collection divided by the total number of elements in the collection |
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population/sample mean |
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outlier |
data values that are markedly different from the rest of the data items |
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Center of mass |
the mean is |
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Interval scale |
data values should be measured using at least an |
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Zero |
the first central moment about the mean is |
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Median |
divides the array into two equal parts |
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Mode |
the observed value that occurs witb the greatest frequency in a data set |
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Measure of locatiob |
provide information on the percentage of observations in the collection whose values are less than or equal to it |
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Percentiles |
divide the ordered observations into 100 equal parts |
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Measure of Dispersion |
help us characterize the data set in terms of how varied the observations are fron each other |
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Reliable |
if we take a random observation from the collection, its value will be close to the mean or to the median |
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Measure of absolute dispersion |
have the same unit as the unit of the observations |
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measure of relative dispersion |
have no unit; can be used in comparing the variability of one distribution with another distribution |
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Range |
distance between the maximum value and the minimum value |
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Interquartile range |
distance between the third and first quartiles of a data set |
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Bienayme-Chebyshev Rule |
approx. range of data |
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z-score |
also called "standard score" |
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measure of skewness |
a single value that indicates the degree and direction of asymmetry of a distribution |
