# Shared Flashcard Set

## Details

Statistics Vocabulary ch2
concept study
22
Sociology
03/06/2006

Term
 interquartile range (IQR)
Definition
 the distance between the lower and upper quartiles: IQR = Q(U) - Q(L)
Term
 lower quartile Q(L)
Definition
 the 25th percentile of a data set
Term
 middle quartile (M)
Definition
 the median of a data set
Term
 upper quartile (Q(U))
Definition
 the 75th percentile of a data set
Term
 outlier
Definition
 an observation (or measurement) that is unusually large or small relative to the other values in a data set
Term
 three causes of outliers
Definition
 1.the measurement is observed, recorded, or entered into the computer incorrectly2.the measurement comes from a different population3.the measurement is correct, but represents a rare (chance) event
Term
 sample z-score (for a measurement x)
Definition
 z=(x-xbar)/s
Term
 population z-score (for a measurement x)
Definition
 z=(x-ยต)/[population standard deviation, or o]
Term
 'p'th percentile
Definition
 For any set of 'n' measurements (arranged in ascending or descending order), a number such that p% of the measurements fall below the 'p'th percentile and (100-p)% fall above it
Term
 standard sample deviation
Definition
 's': the positive suuare root of the sample variance, 's squared', s=the sq. root of 's squared'
Term
 sample variance (for a sample of 'n' measurements)
Definition
 = the sum of the squared distances from the mean divided by (n-1). the symbol 's squared' is used to represent the sample variance
Term
 range (of a quantitative data set)
Definition
 = the largest measurement minus the smallest measurement
Term
 mode
Definition
 the measurement that occurs most frequently in the data set
Term
 skewed data
Definition
 data for which one tail of the distribution has more extreme observations than the other tail
Term
 median (of a quantitative data set)
Definition
 the middle number when the measurements are arranged in ascending (or descending) order
Term
 mean (of a set of quantitative data)
Definition
 the sum of the measurements divided by the number of measurements contained in the data set
Term
 class percentage
Definition
 the class relative frequency multiplied by 100
Term
 class relative frequency
Definition
 the class frequency divided by the total number of observations in the data set
Term
 class relative frequency
Definition
 the class frequency divided by the total number of observations in the data set
Term
 class relative frequency
Definition
 the class frequency divided by the total number of observations in the data set
Term
 class frequency
Definition
 the number of observations in the data set falling in a particular class
Term
 class
Definition
 one of the categories into which qualitative data can be classified
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