Page 66 - MAT KS3 Y8 Cambridge CheckPoint

6.1 Collecting data

7 Ahmad wanted to know how often people in his village go swimming.
He decided to carry out a survey. This is what he wrote.

The population of my village is 238.
I interviewed a sample of 15 people and recorded their answers on this data
collection sheet.
Question How often do you go swimming?
Answer Tally Frequency

Never ||| 3
Sometimes || 2
Often |||| || 7
Very often ||| 3

Conclusion My results show me that the people in my village
go swimming a lot.

a In groups of two or three, discuss and write down the answers to these questions.
i What do you think of Ahmad’s decision to ask a sample of 15 people?
ii What do you think of Ahmad’s data collection sheet?
iii What do you think of Ahmad’s conclusion?
b Still in your groups, complete this task.
i Design a better data collection sheet for Ahmad’s question.
ii Use your data collection sheet to collect data from the students in your class.
iii Write a conclusion based on the data you have collected.
c Compare your data collection sheet and your conclusion with those of other groups.
8 Oditi wanted to know how many pets the people in her village own.
She decided to carry out a survey. This is what she wrote.

The population of my village is 576, so I interviewed a sample of 60 people.
I recorded their answers on the data collection sheet below.
Question How many pets do you own?
Answer
Number of pets 1– 3 3– 4 4– 6 7– 10
Number of people 3 7 9 18 2 3 6 10 1 4 8 11 13 3 9 11 12

Conclusion My results show me that the people in my village have lots of pets.

a In groups of two or three, discuss and write down the answers to these questions.
i What do you think of Oditi’s decision to ask a sample of 60 people?
ii What do you think of Oditi’s data collection sheet?
iii What do you think of Oditi’s conclusion?
b Still in your groups, complete this task.
i Design a better data collection sheet for Oditi’s question.
ii Use your data collection sheet to collect data from the students in your class.
iii Write a conclusion based on the data you have collected.
c Compare your data collection sheet and your conclusion with those of other groups.

64 6 Planning and collecting data