The notation of the median age means that there are as many men younger than 26 working as machine operators as there arc men older than 26.

Ill

GRAPHIC PRESENTATION

Male

Female

WPA, Diviiion of Social Rcsfarch. "Urban Workers on Relief," 1936.

SCAI.E 9

Duration of Unemployment Since Last Non-Relief Job of Unemployed Workers on Relief in May 1934 by Socio-Economic Group of Usual Occupation in the United States.

Note that the total of the bars representing any one group, such as female unskilled workers, is equal to 100 per cent.

FREQUENCY CHARTS

too

>•

m

Frequency polygor 1 from data ^

1^

P^

ft.

Curve obtained fro first smoothing

f

\

/

\

/

\

/

\

/

(Jurve obtained from y' second smoothing i

^

^

c

^

4'

V-

1 1 1 1 Curve obtained from

yf

<g

fornr

all

reqi

lenc

y cu

rve

second smoothing J 1 1 i» 1 /

\yr'

7/

y

//

^

\

/y

\

/

\

\

^

^

_

UN0ER2 4-5

89 1213 16 17 20-21 24 25 28 29 32 33 36 37 COUNTIES YIELD-PER-ACRE GROUPS.IN BUSHELS

U S. Dcparttiwnt of Acriculturc, Burrau of Acricultural Economics.

SCALE .8

Distribution of 2,412 Counties in the United States Into Wheat Yield-per-acre Groups.

This shovwT the three steps in securing a frequency curve.

GRAPHIC PRESENTATION

■|i

HUMDRCDS OF CARS

MAY JUNE JULY AUG. SEPT. OCT.

Rrtlrawn from n Chart liy Biirrnu of AKririiltural Economic*. U. S. IDcpt. of ARriculturc. SCALE 8