“Plot a bell curve for Northfield High Algebra I scores with a mean of 72, showing the number of students at each standard-deviation band.”
看懂背後的決策。
Use one reporting period and one clear unit.
Identify the largest concentration or directional change.
Confirm the displayed values against the underlying data.
Use this bell curve graph when the stated values and labels are the information the reader needs to compare.
常見問題
What does this bell curve graph show?
A bell curve graph plots the frequency of values around a central mean. When a dataset is approximately normal, the curve is highest near the mean and tapers on either side.
How should I read this bell curve graph?
Bell curve graphs are useful for discussing the centre and spread of a dataset, but they should not be used to assume normality without checking the data.
Can I adapt this bell curve graph example?
Yes. Replace the title, labels and values with your own data, then check that the prompt still describes every important element in the chart.