AP STATS: Unit 1

Exploring One-Variable Data

statistics

the science of collecting, analyzing, and drawing conclusions from data

individual

an object described by a set of data

variable

an attribute whose value varies based on the individual it is referring to

categorical

a type of variable that placeseach individual into a particular group

quantitative

a type of variable that describes individuals using counts or measurements

discrete

a type of quantitative variable that has a fixed number of distinct values with nothing in between them

continuous

a type of quantitative variable that uses any value in an interval on the number line

distribution

a description of what value a variable takes and how often it takes that variable

frequency table

a visual that measures counts and is displayed with a bar graph

relative frequency table

a visual that gathers percentages and is displayed in a pie chart

resistant

a kind of measure that is not affected by skewness or outliers

the median

a resistant measure of center where have the data is greater and half the data is lesser

the mean

a non-resistant measure of center that expresses the average of a set of data

range

non-resistant measure of spread calculated by subtracting the smallest value from the largest value

Interquartile Range (IQR)

the range of the middle 50% of a data set

fences

the minimum and maximum values excluding any outliers from a data set

five-number summary

a description of a distribution including the minimum, first quartile, median, third quartile, and maximum

the standard deviation

the average of the distances from each value to the mean

median

the measure of center that should be used when a data set is symmetric and has no outliers

mean

the measure of center that should be used when a data set is skewed or has outliers

interquartile range

the measure of spread that should be used when the data set is symmetric or has no outliers

standard deviation

the measure of spread that should be used when the data set is skewed or has outliers