# Summary Statistics

• ### Which Measure Should I Choose

Lyrics © Mary McLellan
may sing to the tune of Journey's "Faithfully"

How do I know what measure to use
Sometimes there’s symmetry
Sometimes there’s skew

When there’s skew, when there’s outliers
All I know is that I need resistance
The measure of center that is resistant to the skew
The measure of spread that is resistant too
Are the measures that I should choose to use
I guess that I should choose then
Interquartile range and median.

Symmetry, symmetry
Standard deviation and mean
Symmetry, Symmetry
Standard deviation and mean

• ### Which Measure and Spread to Use

Lyrics © Mary McLellan
may sing to the tune of ABBA's "Dancing Queen"

If you have skew,
then you must choose to use median and IQR ooh
Symmetry, standard deviation and mean
If you have skew,
then you must choose to use median and IQR ooh
Symmetry, standard deviation and mean

• ### Transformation Song

Lyrics © Mary McLellan
may sing to the tune of "BINGO"

When the data that you have goes through a transformation
Addition and subtract, addition and subtract
Addition and subtract
Affects the center only

When the data that you have goes through a transformation
Multiply and divide, multiply and divide, multiply and divide
Affects them both

• ### Describe the Distribution

Lyrics © Mary McLellan
may sing to the tune of Fun's"We Are Young"

Give me a second now
I need to get my words straight
I need to learn the vocab that is all about the data’s shape
Uniformed, symmetrical, skewed to the right and the left
Will there be an outlier or is the shape regular
I know I then choose the center, though…
Do I pick mean or median?
So that I don’t get confused the spread that I choose to use is IQR or standard deviation

When the AP test approaches and I want to get a 5, I know what to do:
Describe the distribution
Shape and outliers
Center and spread
Describe the distribution
Shape and outliers
Center and spread
When the AP test approaches and I want to get a 5, this song will help me to thrive