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