Page 65 - MAT KS3 Y8 Cambridge CheckPoint

6.1 Collecting data

✦ Exercise 6.1

1 Which of the three methods of collection would you use to collect this data?

Experiment Observation Survey

a the number of times a drawing pin lands ‘point down’ when it is dropped 200 times
b the number of people that go into your local grocery shop each hour
c the number of brothers and sisters that students in your class have
d the type and number of pets owned by people living in your street or village
e the number of times the king of hearts is drawn from a pack of playing cards in 100 draws
f the number of people that use your local swimming pool in the morning
g the number of times people in your family travelled by train in the last month

2 Mia runs a rollerskating club. She wants to ask the members of the
club if they would like to have training on a Wednesday evening.
There are 38 members in the club.
Should Mia ask all the members of the club, or should she ask a sample
of the members?
Explain your answer.
3 A football team has 860 members in their fan club. The secretary of
the club wants to know if the fans would like some half-time
entertainment during home matches.
a Give two reasons why the secretary should ask a sample of the
members.
b How many members of the fan club should there be in the sample?
4 The population of a village is 340. The local nurse wants to know how
often the people in the village visit the doctor. She decides to ask a
sample of the population. How many people should there be in her sample?
5 There are 948 students in a school. The headteacher wants to know if the students would prefer to
have their lunch break at 12.30 pm or 1.30 pm. She decides to ask a sample of the school population.
How many students should there be in her sample? Give a reason for your answer.
6 Which of A, B or C would be the most suitable degree of accuracy for measuring:
a the heights of the students in a class
A nearest millimetre B nearest centimetre C nearest metre
b the weights of the students in a class
A nearest 10 kilograms B nearest kilogram C nearest 0.1 of a kilogram
c the time it takes students to run 400 m
A nearest minute B nearest second C nearest 0.01 of a second

6 Planning and collecting data 63