Chapter 2 Stats Review

Exam on September 29th @ 6PM

Histogram

A bar chart that shows the distribution of continuous, numerical data by grouping values into ranges called bins and plotting their frequencies as bars.

Left Skewed Histogram

Has a tail to the left.

Right Skewed Histogram

Has a tail to the right.

Modality

Where there is the highest concentration of observations.

Unimodal Histogram

Has one peak where there is a concentration of observations.

Bimodal Histogram

Has two peaks where there is a concentration of observations.

Multimodal Histogram

Has more than two peaks where there is concentration of observations.

Mean/Average

A way to measure the center of the distribution.

Variance

The “average” squared distance from the mean.

Standard Deviation

Roughly how far away the typical observation is from the mean and is the square root of the variance.