Lengths of telephone calls
Use the Wider and Narrower buttons to show that:
Any class width between 1.0 and 2.0 would be acceptable.
Use the Left and Right buttons to show that the starting-point for the first class also affects histogram shape but is less important than the class width.
Mention that if your conclusion from a histogram depends on the choice of classes, you are over-interpreting it.
The data set shows the lengths of 200 long-distance telephone calls (mins) from a company's head office.