Page 68 - Mathematics Coursebook

6.2 Collecting data

) Exercise 6.2

1 Eira asks people in her village to fill in a questionnaire about their local dentist.
These are four of the questions she writes.

1 What is your name? .........................................
.........................................
2 What is your date of birth? .........................................
2
What is your date of birth?
3 Do you agree that the local dentist provides an excellent service?
yes not sure don’t know
4 How many times did you visit the dentist last year?
0 times 1–3 times 3–5 times more than 4 times

a Explain why each question is unsuitable.
b Re-write questions 2, 3 and 4 to make them suitable for a questionnaire.

2 Sham asks people in his neighbourhood to fill in a questionnaire about diet.

These are two of the questions he asks.

1 How often do you buy junk food?
very often often not very often
2 How many times in one week do you usually eat fresh vegetables?
0 times 1–3 times 4–6 times 7 or more times

a Give one reason why question1 is unsuitable.
b Give two reasons why question 2 is suitable.
3 Annika is carrying out a survey on the number of hours
students in her school sleep. This is one of her questions: When you are designing a response
‘How many hours, on average, do you sleep each night?’ section, remember that everyone
Design a response section for Annika’s question. must be able to tick a box.
4 Lars is carrying out a survey on the way students in his class
travel to school.
This is one of his questions: ‘What method do you usually use to travel to school?’
Design a response section for his question.

6 Planning and collecting data 67