“Create a bell curve for Northwind staff commute times from 10 to 70 minutes in five-minute intervals, peaking at 40 minutes with relative frequencies 1, 3, 7, 13, 21, 28, 31, 28, 21, 13, 7, 3 and 1.”
Comprenez les décisions qui le sous-tendent.
Use commute minutes on the horizontal axis.
Identify the most typical commute range.
Note unusually long commutes.
Use when a continuous measure has a roughly symmetric distribution.
Questions fréquentes
What does the peak of a bell curve show?
It shows the most common range of values in the distribution.
Are all datasets bell-shaped?
No. Skewed, multi-peaked or bounded data may need a different chart.
What do the tails represent?
They represent values that occur less frequently than values near the center.