Posted by Rachel on .
if a researcher were studying the effects of a teaching method on patient learning outcomes, how must he or she word the research question (different from hypothesis) to use the ttest for statistical differences? What type of data must he or she collect (interval, ratio, ordinal, nominal)?

Stats 
PsyDAG,
I don't see any need to reward research hypothesis, 9if it is adequately stated.
Assuming that your dependent variable is some test results, you would need at least ordinal data.
http://www.members.cox.net/dagershaw/lol/TwoPlusTwo.html