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Statistics Chapter Test
Vocabulary
9
Mathematics
8th Grade
11/01/2012

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Term
Mean
Definition
the averageof a set of data
Term
Standard Deviation
Definition
measures the spread of the data from the mean
Term
68-95-99 Rule
Definition
68% of the data generally falls within ONE standard deviation from the MEAN
Term
68-95-99 Rule
Definition
95% of the data generally falls within TWO standard deviations from the MEAN
Term
68-95-99 Rule
Definition
99% of the data falls within THREE standard deviations from the MEAN
Term

Mean Absolute Deviation

(MAD)

Definition
the average of the distances from each data value to the mean
Term
Sample
Definition
allows you to make a PREDICTION about a population
Term
Population
Definition
used when it is possible to study an entire set of individuals, items or data
Term
z-score
Definition
describes the location of a data value within a distribution
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