Work through the levels in order. Type your answer and press Check — open the worked solution if you get stuck. Answers like -6, 3/4 or 0.25 are typed exactly as shown. A ⭐ Bonus Challenge at the end is extra credit — skip it if the rest was hard work.
Level 1 · Warm-up
1 Is "eye colour" categorical or numerical?
Show worked solution
Categorical.
2 Is "number of siblings" discrete or continuous?
Show worked solution
Discrete — you cannot have 2.4 siblings.
3 Asking EVERY member of a group is called a census or a sample?
Show worked solution
A census.
Level 2 · Core
4 Is "height" discrete or continuous?
Show worked solution
Continuous.
5 Is "postcode" categorical or numerical?
Show worked solution
Categorical — digits, but arithmetic on them is meaningless.
6 What kind of sample gives everyone an equal chance of being chosen?
Show worked solution
A random sample.
Level 3 · Challenge
7 You survey only your friends about school lunches. What is the problem? (one word)
Show worked solution
Bias — the sample does not represent the group.
8 A survey offers the options "0–5" and "5–10". What is wrong?
Show worked solution
They overlap — 5 fits in both, so answers are ambiguous.
9 Is "shoe size" treated as discrete or continuous?
Show worked solution
Discrete — only set sizes exist, so it behaves as counted data.