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# MATH 153 Chapter 3

### Summarizing Data - Statistics/Parameters Formulas

Three Measures of Center Mean, Median, Mode
Three Measures of Variation Range, Standard Deviation, Variance
Symbol for Sample Mean X Bar
Symbol for Sample Standard Deviation s
Symbol for Population Mean Mu
Symbol for Sample Population Standard Deviation Sigma
Area % under curve for =/- 3 standard deviations 99.7%
Area % under curve for =/- 2 standard deviations 95%
Area % under curve for =/- 1 standard deviations 68%
Symbol for Sample Variation s Squared
Symbol for Sample Population Variation Sigma Squared
Another name for normal curve The Bell Curve
True or​ false: A data set will always have exactly one mode. False
The sum of the deviations about the mean always equals _________. zero
________________ represents the number of standard deviations an observation is from the mean. z-score
________________ divide data sets in fourths. Quartiles