Comparing data carefully — Data, 7–10 years
Read a chart to find more, fewer, equal amounts and differences without guessing beyond the evidence.
What the data really says
To compare data, look at the same measure for each group. You can say “more”, “fewer”, “the same” or “three more”, when the numbers support it. A chart can show a difference, but it cannot tell you why that difference happened.
Why check the numbers?
Our eyes often notice the tallest bar but miss a small difference or a strange scale. Reading the labels and subtracting the totals solves that problem. It helps you make a conclusion based on evidence instead of on a quick impression.
Example: comparing lunches
A chart shows packed lunches: Monday 6, Tuesday 9 and Wednesday 7. Tuesday has the most, Monday has the fewest, and Wednesday has one more than Monday. The difference between Tuesday and Monday is 9 minus 6, which is 3 lunches.
Trap: guessing the reason
If more children bring lunch on Tuesday, someone may decide that Tuesday food is tastier. That could be true, but the chart does not include children’s reasons or the food they ate. Say only what the data supports, such as “Tuesday had three more lunches.”
Use: making a fair decision
A group choosing a meeting time can count how many people are free at each time. Comparing the totals may show that 15:00 suits eight people while 16:00 suits five. The count helps with the decision, although it does not replace talking about anyone’s special need.
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