See how the key terms are connected by looking at this concept
map.

Test yourself on the key terms with this

 Use online calculators that make doing some advanced statistical analyses
simple. For example,
 if you wanted to calculate effect size from your t test , you could use this
effect
size calculator.
 if you had unequal variances and wanted to do Welch's t test,
you could use this online calculator

Help
with answering the endofchapter exercises.

 Use these very short tutorials to review the
basics of significance testing and the
basics of
the t test.
 Use the
authors'
online t test calculator to do independent t tests and to see the effects of sample size on t values
(for educational use only; for actual research data, use
VassarStats)
 Get a better sense of how often Type 1 errors occur, try this quick
simulation.
 To learn more about Type 2 errors and how sample size affects power, try
this quick simulation.
 If you are confused about the central limit theorem (p. 408), this 10minute
video from the Khan academy
may help you.
 Get a better understanding of random assignment by going through this
short (it shouldn't take you more than 10 minutes) but useful
tutorial.
 Get some appreciation of how random error could make two groups differand
how large sample sizes tend to reduce the degree to which random error will
cause big differences between groupsby playing with this
fun
simulation.

Take some practice quizzes
 Short, general quiz
 More specific quizzes
 Take 15item quizzes over the first part of the chapter.
 Take 11item quizzes over the second part of the chapter.
 Take 4item quizzes over the third part of the chapter.
 Take 9item quizzes over the fourth part of the chapter.
 Take 10item quizzes over the fifth part of the chapter.

Find out how to conduct a field experiment by reading "Web Appendix: Field experiments."
Get a better idea of the steps involved in conducting a study by reading "Web Appendix: Conducting a Study."
If you want to write up your method section, you may wish to consult the
tips on writing a method section in Chapter 15 as well as the Method section
part of the checklist in Appendix A.
If you want to write up the results of a simple experiment, you may wish to download this tutorial.
This web page will format your t test results correctly
