Page 63 - MAT KS3 Y8 Cambridge CheckPoint

6 Planning and collecting data

In the United States of America elections are held every two years to
Key words
choose members for the House of Representatives. This is one of the
groups of people who run the country. Make sure you learn and
understand these key words:
Each American state chooses representatives. The number they can
method of collection
choose depends on the how many people live in that state. The more
survey
people who live in a state, the more representatives they can choose.
questionnaire
It is therefore very important that accurate records are kept of the
interview
number of people living in each state.
experiment
In order to keep accurate records, a census is held every 10 years. A
observations
census is a way of collecting data. It is a questionnaire that must be
population
filled in by every household in the USA.
sample
The most recent census was in 2010. The questionnaire had only degree of accuracy
10 questions, which people were able to answer in about 10 minutes. discrete data
The results of the 2010 census showed that there were 308 745 538 continuous data
people living in the USA. There are 435 representatives in the House frequency tables
of Representatives. This means that there is one representative for equal class intervals
roughly every 710 000 people in the USA. two-way table

The map shows how
WA NH (4)
many representatives (12) ME
there are in each state MT (3) ND (3) VT (3) (4)
of the USA. You can OR (7) MN NY
WI
see that even though ID (4) SD (3) (10) (10) MI (29) MA (11)
RI (4)
California is not the WY (3) (16) CT (7)
largest state, it has NV (6) NE (5) IA (6) IL OH PA (20) NJ (14)
UT IN (18)
the largest number CA (6) CO (9) (20) (11) WV VA DE (3)
of representatives. (55) KS (6) MO (5) (13) MD (10)
(10)
This is because it has KY (8) NC (15) DC (3)
AZ TN (11)
the largest number of NM (5) OK (7) AR SC
(11) (6) (9)
people living there, out MS AL GA
of all the other states TX LA (6) (9) (16)
HI (3)
in the USA. (38) (8)
FL
AK (4) (29)

In this unit you will learn more about collecting data, and also about the different types of data.

6 Planning and collecting data 61