I gave my students the 'apply your knowledge' blue box questions in the Flanagan and Cardwell Year 2 book (Brown dog) Question 2d asks which test would you use and why, when: 'A study using a correlational technique in which one measure is ordinal and the other ratio'. After much to'ing and fro'ing I couldn't make my mind up between Pearsons R and Spearmans rho. Ratio data parametric, Ordinal data non parametric. I told them it would be unlikely such a question would come up, would it? Can somebody help?