STATBELT Utility - the Statistical Basics Exploratory Learning Tool

Approximately normal: the points fall close to a straight line. A little wiggle is normal, especially with small samples.
Right-skewed: the points curve upward, with a bend at the right end above the line.
Left-skewed: the points curve downward at the left end, below the line.
Heavy tails: an S shape, with the left end below the line and the right end above it.
Light tails: a reverse S shape, with the ends pulled in toward the middle.
Outliers: one or two points far away from the line.

From Stat-Man’s Utility Belt!

Type, copy/paste, or import data by dragging and dropping .csv or .xls files into the table. Then use the menus below to describe your data, graph it, run statistical tests, or use the built-in calculators.

Inference for Proportions