Hello.. does anyone know how to run a validation study to validate questionnaire? thanks

does that mean the variable being tested for; example idiocy is tested after gender is tested in liking justin? im still unclear to explain this controlling factor in simple terms.. im actually new to spss.. would appreciate some help.. thank you very muchy :)

can another example be given here?

Hi... I would like to know what sample size calculation to use when conducting an intervention study that applies the randomized control trial study design?

Thank you for ur kind assistance.