Job satisfaction ratings of 40 merchandise buyers
The example is a data set that could have arisen as a sample from a normal population. Mention that we don't have enough information to really tell the shape of the underlying population's distribution, but that a normal population seems plausible.
Use the sliders to adjust the normal parameters and match the shapes of the pdf and histogram as well as possible.
This normal population could be used as an approximate model for how the data might have arisen.
Merchandise buyers are critically important to the success or failure of retail ventures, both through negotiations over pricing and decisions about the types of product that will be stocked. Because of high turnover of staff in this area (estimated to be over 25 percent per year), research was carried out to determine the factors related to turnover.
The histogram shows job satisfaction ratings of a sample of buyers on a scale of 0 (worst) to 30 (best).