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# Math Vocab

### Chapter 9 Vocab

TermDefinition
5 point summary Consists of 5 data values, lower extreme, upper extreme, lower quartile, upper quartile, and median
Biased Sample A sample in which members are not randomly selected
Box Plot A graphical display of a 5 point summary ( uses 5 data values)
Box and Whisker Plot A graphical display of a 5 point summary
First Quartile Also known as the lower quartile. It is the median of the lower half of the data set
Interquartile Range Difference between the first and the third quartile
Leaf The least digit in each item of the data set, when displayed in a stem and leaf plot.
Lower Quartile The median of the lower half of a data set. 25% of the data fall on or below this value
Mean Absolute Deviation The average distance of each item of data from the mean
Measure of variation A measure of the spread of data from a measure of center
population all the members or objects about which you want information
random sample a set of data randomly selected from a population so that every member of the population has an equal chance of being selected
range The difference between the greatest and the least values in a data set
sample a set of data taken from a population
sample size the number of members in a sample
second quartile the median of a data set. 50% of the data fall on or below this value
simple random sampling a sampling method in which every member of a population has an equal chance of being selected
stem all digits except the one of least place value in an item of data displayed in a stem and leaf plot
stem and leaf plot a two column graphical display in which the least digit of each item of data is displayed in the right column and the other digits in the left column
stratified random sampling a sampling method in which the population is divided into nonoverlapping groups from which members are randomly selected
systematic random sampling a sampling method in which the first member is randomly selected, and the subsequent members are selected at regular intervals
third quartile the median of the upper half of a data set, also known as the upper quartile. 75% of the data fall on or below this value
unbiased sample a set of data randomly selected from a population so that every member of the population has an equal chance of being selected
upper quartile the value in a data set that 75% of the data fall on or below this value also known as quartile 3
Created by: Neonpink15