Understanding The New Statistics

6

Two Simple Designs

Many of the simplest experiments compare two conditions, perhaps using the two-independent-groups design or the paired design. You may be familiar with these designs in the context of the independent-groups t test and paired t test. This chapter discusses how to use CIs to present and interpret results from these two designs. Here's the agenda:

• The dreadful ambiguity of conventional figures

The two-independent-groups design:

• Displaying the data
• A rule of eye for estimating the p value
• Presenting your own data
• Illustrating ...