Lesson

What types of data could result from a survey?

What type of data is each of the following:

a

The time spent watching TV each day.

A

Categorical

B

Numerical

Worked Solution

b

Favourite TV show.

A

Categorical

B

Numerical

Worked Solution

Idea summary

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

This video looks at different types of questions.

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

b

To make the question closed, the manager could instead ask:

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

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.

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

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

Sport | Student |
---|---|

\text{Tennis} | 5 |

\text{Rugby} | 21 |

a

According to the survey, which sport is most popular?

A

Tennis

B

Rugby

Worked Solution

b

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

Worked Solution

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.

uses appropriate methods to collect data and constructs, interprets and evaluates data displays, including dot plots, line graphs and two-way tables