Session 5 — Be a Data Detective

Duration: 60 min · Format: live online · Ages: 8–11

Session goal: by the end, students can say what data is, write a clear and fair survey question, and collect answers using tally marks.

Before class — prep (5 min)

• Have the survey diagram below ready to share on screen (favourite fruit votes).
• Open Google Sheets in a tab — you'll show it briefly and use it for the extension.
• Ask students to have paper and a pencil ready for their own tally sheet.

Agenda

0:00 · Hook (5 min)

Ask the class and take a few quick answers (chat or unmute):

• "How many windows are in the room you're sitting in right now? Count them."
• "How many people live in your home?"

Let them call out numbers, then reveal: those numbers you just counted are data. Data is simply information we collect — numbers, answers, and facts. Tell them that today they become data detectives.

0:05 · Teach — What is data? (12 min)

Explain, writing the key words on your shared screen:

• Data = pieces of information we gather.
• Examples: today's temperature, everyone's favourite colour, the goals scored in a match.
• When you collect lots of data and look at it together, you can discover answers.

⚠ Watch for the mix-up: students often think data has to be a number. Remind them that data can also be words and facts (a favourite colour, a yes/no answer) — not just numbers.

Ask: "Name one piece of data about you right now — your age, your favourite game, how many pets you have." (Take 2–3 answers.)

0:17 · Teach — Surveys collect data (13 min)

Explain: a survey is when you ask the same question to many people and write down every answer. Land the three fairness rules out loud:

1. Give simple choices — like 3 options, not twenty.
2. Ask enough people — not just your best friend.
3. Write down every answer — even the ones you didn't expect or don't like.

Share this diagram — a survey of "What's your favourite fruit?", where each block is one vote:

Apple = 5 · banana = 7 · grapes = 3.

Ask: "Which fruit got the most votes? Which got the fewest?" (Answer: banana most with 7; grapes fewest with 3.)

0:30 · Activity — Make your own survey (18 min)

Have students design and run a mini survey.

1. Pick a fun question (e.g. favourite animal, colour, or game).
2. Choose exactly 3 answer choices.
3. Ask 8–10 people (family, or classmates in the chat) and make a tally mark for each answer.
4. Count the totals.

Demo the tally trick on screen: draw one line per vote, and cross out every 5th — this makes them easy to count in groups of five.

Circulate (or ask a few students to share their screen/paper): check that their choices are simple and that they are recording every answer, not only the ones they like.

Debrief: "You just collected and organised real data — exactly what a data scientist does first."

0:48 · Check for understanding (7 min)

Ask these aloud or drop them in the chat. Answer key (for you):

1. What is data? → Information we collect — numbers, answers, or facts.
2. What makes a survey fair? → Clear choices, asking enough people, and writing down every answer.
3. In the fruit survey, which fruit won? → Banana, with 7 votes.

0:55 · Wrap-up + homework (5 min)

• Ask one student to finish the sentence: "Data is…"
• Homework — Detective's guess: before you ask anyone, secretly write down who you think will win your survey and hide it. Then run your survey with at least 10 people, reveal your guess, and see if you were right. Keep your tally sheet safe — next session we turn it into a chart!

Teaching notes

• Correct this misconception: "data is only numbers." Reframe as any information we collect, including words and yes/no answers.
• Fast finishers (extension): introduce tables — real datasets live in tables where rows are records (one per person) and columns are the facts (name, age, score). Have them open Google Sheets and type their survey as one row per person with columns like Name and Fruit. Challenge: collect two facts per person (e.g. favourite fruit and age) to make a mini-dataset. Explore friendly real datasets on Google Dataset Search.
• Low-tech fallback: no devices needed — the whole activity works with paper and pencil; run one survey as a whole class if some students can't collect their own.

Vocabulary

Resources

• Google Sheets — a place to type your data into rows and columns.
• Our World in Data — see real data about the whole world (with a grown-up).
• Census At School — fun data activities for kids.
• Google Dataset Search — explore friendly real datasets (extension).

Next session

Session 6 — Show It! Charts & Graphs: students turn their tally counts into colourful charts they can read in a flash.