The Manga Guide to Statistics

6

Let's Lk at the Relationship

betwn Two Variables

Nice weather.

*Scritch, clump

Not a bad

day to study

outdrs.

Why are you

wearing that

sandal?! You're

wearing two

dierent

shoes!

Oops!

You're

right.

If I were

here with

mr. Igarashi...

I'd be so hay.

Mr. Igarashi...

Mr. Igarashi...?

Today, I am going

to talk about

the relationship

betwn two

variables.

Oh, no! I am

begiing to

lose my memory

of him.

*Scritch, clump

*

*

Mr.

Yamamoto's

quirks are

t strong,

and that's

making me

forget

Mr. Igarashi!

Oh! Thank you For wiping

the bench for me.

Oh, I

know

that

song!

OPEN!

Are you

listening?

Ah...Yes I am.

So, for example, Does

a taer person weigh

more? Or, do people

favor dierent soda

brands if they are

dierent in age?

Or, Do people suort

dierent political

parties if they live in

dierent areas?

Is that something like

“Do you love me, now

that I can dance?”

NOW...

Oh, here

begins the

leon!

Let's Lk at the Relationship betwn Two Variables 113

You can s

whether or not

two variables are

related to each

other by drawing a

chart.

Scaer chart of height and weight

Numerical and

numerical

Weight

(Kg)

Height (cm)

Numerical and

categorical

Categorical

and

categorical

Scaer chart of favorite Soda brand and age

Cylinder chart of Place of Residence

and suort of political party x

rural areas

urban areas

Aha!

114 Chapter 6

However,

unfortunately,

the charts do

not te you how

strongly the

variables are

related.

In other words,

you caot grasp

the "degr" of

relation.

What should I

do then?

we' figure out

the coeicient

that can be used

together with the

chart to describe

coelation, or

the degr of

Linear relation of

two variables.

aNOTHER index...

Hm.

If so...

Can a topic like

this be analyzed

statisticay t?

*special

Feature Article:

Fashionable

Girls' Survey

*how Much Do

They Spend On

brand-name

fashions?

Great! This would

make a very gd

example.

*

*

Let's Lk at the Relationship betwn Two Variables 115