Bell-Shaped: Ahistogram with a prominent 'mound' in the center and similar tapering to the left and right. One indication of this shape is that the data is unimodal – meaning that the data has a single mode, identified by the 'peak' of the curve. What does a bell-shaped histogram me...
The most common reason for a skewed histogram is an underlying process that is changing while the data are being collected. As the process moves around, the data move with the process, and the resulting pile of data tells us nothing about what probability model to use. The mor...
Unimodal If you know or suspect that your parent distribution is not unimodal and has more than one peak, then you might need more than 30 in your sample to feel good about using the Central Limit Theorem. Consider the following multimodal population histogram with three distinct peaks. If you...