Algebra 1 Unit 7

median

the middle number in a statistical set that is arranged in numerical order

dependent variable

the output variable in a function that changes based on the changes of the independent variable

data sampling

the selection of a sample to estimate the characteristics of an entire population

mean

the sum of all the values in a data set divided by the number of values in the set

mode

the value or values that occur most often in a statistical data set

statistics

numerical data

quartile

one of three values that divide a statistical data set into four groups having an equal number of values

systematic random sampling

sampling in which members of the sample are chosen according to a specified time or time interval

stratified random sampling

sampling in which the population is first divided into similar, nonoverlapping groups, or strata, from which random samples are chosen

simple random sampling

sampling that creates a random sample by choosing members that are just as likely to be picked as any other member

range

the difference between the greatest and the least values in a statistical data set

interquartile range

the difference between the upper and lower quartile of a statistical data set

independent variable

the input variable of a function whose value determines the value of the dependent variable

measure of variation

the value that describes the spread of values in a statistical data set; the range of a statistical data set

census

a statistical study of an entire population

frequency table

a table showing the frequency of each data value

trend

a tendency in a certain direction

measure of central tendency

a value or values around which the values in a statistical data set tend to cluster or group; the mean, median, and mode of a statistical data set

percentile

a value that divides a statistical data set into 100 groups having an equal number of values

frequency of data

a value that expresses how often a piece of data appears in a data set

outlier

a value that is well outside the range of all the other values in a statistical data set

histogram

a visual representation of data frequency using adjacent vertical bars whose heights are based on the frequency of the data

circle graph

a visual representation of data in which a circle is divided into sectors, each of which represents a percent of the whole data set

bar graph

a visual representation of data using horizontal or vertical bars whose lengths are related to the frequency of the data

line graph

a visual representation of data using line segments

stem-and-leaf plot

a visual representation of numerical data in which each number in a set of numbers is split into a stem, formed by the greatest common place value of the set, and a leaf, formed by the next greatest common place value of the set

box-and-whisker plot

a visual representation of numerical data that shows how values within a data set are distributed

data

facts, statistics, and pieces of information

bias

favoring one or more parts of a population over the others

data sets

groups of data that have similar qualities or characteristics

scatter plot

a graph with points plotted on a coordinate plane to show a relationship between two data sets

population

a large group of individuals selected for a statistical study

sample

a portion of a population selected to represent the population

negative correlation

a relationship between two quantities in which an increase in one is accompanied by a decrease in the other

positive correlation

a relationship between two quantities in which an increase in one is accompanied by an increase in the other

no correlation

a relationship between two quantities in which both quantities may increase or decrease independently of what happens with the other quantity

random sample

a sample that is chosen without any particular preference and which represents an entire population