University of California, Berkeley: Philip Stark's SticiGui: "Chapter 27: Hypothesis Testing: Does Chance Explain the Results?"
Read Chapter 27, which it introduces you to the concepts in hypothesis testing to test values of a true population parameter given sample statistics or to test and compare the statistics from two or more similar samples. Pay special attention to the following terms: null hypothesis, alternative hypothesis, significance level, power of a test, and p-values. These terms are widely used whenever a sample with data is analyzed. There are several exercises and Java applets embedded in the text that are meant to further reinforce your learning. Do not skip these exercises! For instructions on how to navigate these exercises, see "Special Instructions on SticiGui Exercises and Java Applets” in the "Course Information” section above.