(0:00-0:56) Introduction to Motivating Context
(0:57-1:34) Discussion of Hypothesis Tests with Two Samples
(1:35-3:30) Calculation of Differences and Sample Statistics
(3:31-4:07) Definition of Null Hypothesis with Two Samples
(4:08-4:20) Definition of Alternative Hypothesis with Two Samples
(4:21-5:20) Formulation of Hypotheses
(5:21-6:04) Further Discussion of Hypothesis Tests with Two Samples
A claim about a population difference that serves as the starting assumption for a hypothesis test. The null hypothesis usually tests that the difference in a certain parameter between two samples, such as a mean or standard deviation, is equal to zero.
A claim that there is a difference in a population parameter between two samples. The alternative hypothesis is always an inequality statement.