 # 10.02 Surveys

Lesson

## Ideas

What  types of data  could result from a survey?

### Examples

#### Example 1

What type of data is each of the following:

a

The time spent watching TV each day.

A
Categorical
B
Numerical
Worked Solution
Create a strategy

Determine if the type of data will be words or numbers.

Apply the idea

The data refers to the time spent that is counted or measured using a number.

So the type of data is numerical. So, the correct answer is B.

b

Favourite TV show.

A
Categorical
B
Numerical
Worked Solution
Apply the idea

The data refers to a name of a TV show that is a word.

So the type of data is categorical. The correct answer is A.

Idea summary

If the data contains words it is categorical. If the data contains numbers it is numerical.

## Types of questions

This video looks at different types of questions.

### Examples

#### Example 2

A restaurant manager asks his customers the following question:

“How would you describe the taste of our food?”

a

What type of question is this?

A
Open
B
Closed
Worked Solution
Create a strategy

Apply the idea

A person can describe taste in a variety of different ways. There is no limit to how it can be described.

So the question is open, option A.

b

A
"How would you rate the taste of our food on a scale from 0 to 5?"
B
"How does our food compare to the restaurant next door?"
C
"What did you like most about our food?"
Worked Solution
Create a strategy

Choose a question with limited number of responses.

Apply the idea

Option A has limited possible responses on the scale 0 to 5.

So, the correct answer is Option A.

Idea summary

If our question has a limited set of answers, such as yes/no, red or blue, agree/disagree, it's a closed question. If there is an unlimited number of answers possible, then the question is open.

## Survey results

This video shows how survey results can be used and how to be careful about making assumptions.

### Examples

#### Example 3

Kathleen wants to find out the favourite sport of students at her school. She surveys some students and the results are below.

a

According to the survey, which sport is most popular?

A
Tennis
B
Rugby
Worked Solution
Create a strategy

Choose the sport with the largest number of votes.

Apply the idea

So, the correct answer is option B.

b

For the survey, Kathleen asked all her teammates from her Rugby team. Do you trust the results of Kathleen's survey?

Worked Solution
Create a strategy

Look at the range of students who were asked in the survey.

Apply the idea

A survey should ask a reasonable number of people from across the group if we are trying to gather information. She asks a range of students from a rugby team, who probably prefer rugby over tennis, then no, we can't trust the survey's result.

Idea summary

When we make a survey, we need to make sure we ask enough people, and choose a variety of people, to answer the questions.

### Outcomes

#### VCMSP205

Pose questions and collect categorical or numerical data by observation or survey