ACARA v9 CONTENT DESCRIPTION “acquire data for categorical variables through surveys, observation, experiment and using digital tools; sort data into relevant categories and display data using lists and tables”
Every dataset begins life as a question someone actually wanted answered: how do we get to school, which sauce should the sizzle stock, which number does the die favour? Year 2 opens four doors to the answers — ask people (a survey), watch what happens (observation), make it happen (an experiment), or let a device do the counting (a digital tool). Whatever the door, what comes through is a mess of single answers, and the craft of this unit is turning that mess into lists and tables that can be read.
The lunchbox survey
Ten classmates, one question. Write down every answer, in order.
Press the button to ask each classmate and write the answer down, in order.
A survey is asking, written down
A survey is asking, written down. The discipline is in the writing: every answer goes on the list, in the order it arrives, with nothing improved and nothing skipped — a list is a faithful diary of the data. Its weakness is deliberate to notice: ten honest answers in arrival order are surprisingly hard to read. Children should feel that difficulty for a moment, because it is the exact reason sorting and tables were invented.
Watch the gate
You cannot survey a car. Watch the gate and tally what you see.
You cannot survey a car — you watch the gate and make a mark for each arrival.
Observation: when you cannot ask
Some data cannot be asked for. A car at the school gate will not fill in a survey; you watch, and you mark what you see as you see it. That is observation, and the tally marks from Year 1 are its natural pencil — quick enough to keep up with events that will not wait. The skill is recording in the moment: an arrival missed is a number quietly wrong forever.
From list to table
A Bunnings sausage sizzle. Sort the orders and the table builds itself.
Ten sausage orders in a pile. Sort each one into its row and the table builds itself.
A table is a sorted list, counted
A table is a sorted list with the counting already done. Sorting means choosing categories the question actually cares about — the sizzle needs tomato, barbecue and none, not what colour shirt the customer wore. Each order then has exactly one home, and when the last one lands, the table reads itself: category beside count, two columns doing the work of a hundred scattered answers. If an answer fits no category, the categories were chosen badly — choose again.
Roll and record
Nobody asks a die. Roll it twelve times and record what lands.
You cannot ask a die a question — you roll it. Twelve rolls, recorded as they land.
An experiment makes its own data
An experiment is data you make yourself. Nobody can survey a die; you roll it, and the results exist only because you acted. The rule that matters is recording every result, including the dull ones — an experiment where only the exciting rolls get written down is not an experiment, it is a story. Rolling, dropping, planting, timing: Year 2 experiments are small, but the habit of letting the results speak for themselves is the whole of science in miniature.
The class clicker
Tap to vote. The tool sorts and counts the moment data arrives.
Every tap is one vote. The tool records, sorts and counts in the same moment.
Digital tools count for you
Digital tools record, sort and count in the same instant — a class clicker has the table built before the last hand goes down. Children should use the speed and also see through it: underneath, the tool is doing exactly what the sausage sorter did, one category, one count, nothing more mysterious. A tool that counts for you is a gift; a tool you cannot explain is a trap. Fast is good — understood and fast is better.
The table talks
A finished canteen table. Every answer is already sitting in it.
A finished canteen table. Ask it a question — the answer is already there.
Tables answer questions
The table is where the work pays off. Which was most common, how many in all, how many more of this than that — each question is answered by numbers already sitting in plain sight, no recount needed. Hold on to the loop this unit walked: a question, a door to the data, a sort, a table, an answer. The next unit takes the very same table and dresses it as different graphs — new clothes, same numbers, and the comparing of those costumes is its own small art.
Quick self-check
1. To find out which fruit classmates like best, the best first step is...
2. Counting cars, buses and walkers at the school gate is...
3. Rolling a die 12 times and recording each result is...
4. A table shows: pies 8, sushi 5, salad 3. How many orders in all?
5. A list and a table hold the same ten answers. The table is easier to read because...