Algebra 1 Common Core Student Edition, Grade 8-9

Sa m p l e s a n d Su r v e y s

S- I C. B. 3 Re c o g n i ze t h e p u r p o se s o f an d d i f f e r e n c e s

among sam p le surveys, experim ent s, and observat ional

st u d ies...

M P1, M P2, M P3, M P4, MP 6

Co m m o n Co r e St at e St a n d a r d s

Object ive To classify data and analyze samples and surveys

I can't quite

put my finger on

it, bu t there's

something fish y

about this survey.

MATHEMATICAL

PRA CTI CES

f ' Getting Ready!

Th e manager o f a Th ai r est au r an t

wants to know how often people in her

city eat Thai food. She surveys 200

o f her cust om ers. Th e manager says

the results in the histogram show that

most people in the cit y eat Thai food

at least 10 times per year. Do you

think there were any problems with the

survey? Exp lain.

Fr e q u e n c y o f Ea t i n g Th a i Fo o d

70

9 1 0 - 1 9 2 0 - 2 9 =

Fr e q u e n cy Per Ye a r

Lesso n

Vocabulary

quantitative

• q u alit at ive


• u n ivariate


• b ivariate


• p o p ulatio n


• sam p le


• bias

In the Solve It, the restaurant manager collected data from the customers of the

restaurant. In this lesson, you will learn about ways to collect data.

Essent ial Und er st and ing When collecting data to solve a problem, you need to

make sure that your methods are fair and that you accurately represent the results.

You can collect data using measurements or categories. Quantitative data measure

quantities and can be described numerically, such as test scores and ages. Qualitative

data name qualities and can be words or numbers, such as sports or ZIP codes.

Ty p es o f Dat a D escr i p t i o n Ex a m p l e s Y

Quantitative Has units and can be

measured and numerically

compared

Age: 13 yr

Weight: 214 g

Time: 23 min

Qualitative Describes a category and

cannot be measured or

numerically compared

Hair color: brown

Attitude: optimistic

ZIP code: 02125

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