What You Need to Know

Primary data is collected firsthand (surveys, experiments)

Secondary data is from existing sources (internet, books)

Categorical data has labels; numerical data has numbers

Continuous data can take any value; discrete data takes specific values

Key Vocabulary

A method of collecting data by asking questions

A group selected from the population to represent it

When data collection favours certain outcomes

A mark used to count data as it is collected

Select the correct answer for each question. Click "Check Answer" to see if you are right.

Question 1

Which type of data is "the number of siblings a student has"?

Continuous Categorical Secondary Discrete numerical

Question 2

A student surveys 30 friends about their favourite food. This is:

Primary data Secondary data Continuous data Biased data

Question 3

Which would make a survey biased?

Using a random sample Asking only students from one class Recording all responses Using clear questions