After completing this module you should understand that there is more to determining if two samples are different than simply comparing their respective means. Although the difference between the means is important, so, too, are the standard deviations and the sizes of the samples. You also should understand that there are statistical methods for determining if two samples are different, but that such methods can establish only a level of confidence in the conclusion and are subject to error. Finally, you should feel comfortable using the t-test applet to compare data you collect in lab.
Additional information on the topics covered in this module is available using the link on the left for further study, or return to the Data Analysis home page to explore other modules.