Design and Decision

Design and Decision

1. Type I Error: Incorrect rejection of a true null hypothesis (false positive)

   • Preferred *think pregnancy test*

2. Type II Error: Failure to reject a false null hypothesis (false negative)

   • Not Preferred *think pregnancy test*

3. Testing involves introducing "control" for alternative explnations suggested by theory, intuition, and observation

   • We build confidence by repeated testing

4. Science is an empirical activity defined by measurement

   • We use numbers to precisely express our measures quantitatively
     • Good qualitative research sets everything in motion - start with compelling ideas

5. Sciences cannot be used to prove anything

   • We can gradually strengthen our confidence with science