Statistical Terminology

_Part Five

A histogram is a useful graph for quantitative data (we call these bar graphs for qualitative data).

Relative Frequency: Number of items in each class / total.; The proportion/likelihood that each item falls in a certain class.
Frequency: Number of items in each class.

Uniform

The Y-values are equal across the X-values.

Bell-Shaped

The graph peaks in the center and each end fades off.

Bimodal

Two symmetrical equal humps on either end.

U-Shape: The lowest and highest X-values are also the Y-values highest values.

Positively Skewed Distributions Right Skewed Describes the direction of the tail

Graph starts high and ends low.

Negatively Skewed Distributions Left Skewed Describes the direction of the tail

Graph starts low and ends high.