Khan Academy Static

Tests_about_a_population_mean

These significance tests tell us if a sample offers convincing evidence that a population mean is different from some hypothesized value.

Tests_about_a_population_proportion

These significance tests tell us if a sample offers convincing evidence that a population proportion is different from some hypothesized value.

The_idea_of_significance_tests

This tutorial gives some intuition for how we go through a significance test, what a p-value is, how we make conclusions, and what types of error we may make in our conclusions.