AP Statistics Unit 1: Exploring One-Variable Data

Quantitative Variable

Thsi type of variable takes on numerical values for measured or counted quantities

Categorical Variable

Takes on values that are category names or group labels

16/23

What is the marginal proportion in this table
(External out of all students)

3/23

What is the joint proportion in this table

(Internal Math out of all students)

3/7

What is the conditional proportion in this table

(Internal out of math)

0

To avoid misleading graphs, all graphs need to start at ____

Segmented Bar Graph

In this type of graph, the bars stack up to make 100%

Mosaic Plot

In this type of segmented bag graph, the width of the bars is proportional to the group size

Association

Knowing the value of one variable helps us predict the other

Discrete

This type of variable can contain a countable number of values (no decimals)

Continuous

This type of vaariable can contain an infinite number of values (decimals are ok)

Skewed Left

The second graph in this image is _____

symmetrical

The first graph in this image is _____

Skewed Right

The third graph in this image is _____

Standard Deviation

Average distance from the mean

Variance

(SD)²

Nonresistant

The mean and Standard Deviation of a data set are ______ because they are greatly affected by outliers

Resistant

The median of a data set is _________ because it is minimally affected by outliers

IQR

Interquartile Range (Q₃-Q₁)

Low outliers

These are <Q₁ - 1.5 * IQR or <mean - 2SD

High outliers

These are >Q₃ + 1.5 * IQR or >mean + 2SD

Unimodal

When data is this shape, it has one “peak”

Bimodal

When data is in this shape, it has two “peaks”

Mean

Sum of all values divided by the number of values

Median

“middle value” of a data set

Q1

Median of the first half of a data set (Not including the median)

Q3

Median of the second half of the data set (Not including the median)

Range

Difference between the max and min values