Term
interquartile range (IQR) 

Definition
the distance between the lower and upper quartiles: IQR = Q(U)  Q(L) 


Term

Definition
the 25th percentile of a data set 


Term

Definition


Term

Definition
the 75th percentile of a data set 


Term

Definition
an observation (or measurement) that is unusually large or small relative to the other values in a data set 


Term

Definition
1.the measurement is observed, recorded, or entered into the computer incorrectly 2.the measurement comes from a different population 3.the measurement is correct, but represents a rare (chance) event 


Term
sample zscore (for a measurement x) 

Definition


Term
population zscore (for a measurement x) 

Definition
z=(xยต)/[population standard deviation, or o] 


Term

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 (100p)% 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 (n1). 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

Definition
the measurement that occurs most frequently in the data set 


Term

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

Definition
the class relative frequency multiplied by 100 


Term

Definition
the class frequency divided by the total number of observations in the data set 


Term

Definition
the class frequency divided by the total number of observations in the data set 


Term

Definition
the class frequency divided by the total number of observations in the data set 


Term

Definition
the number of observations in the data set falling in a particular class 


Term

Definition
one of the categories into which qualitative data can be classified 

