How to change the font size and how can I randomize participants at the very beginning

Question

Hello,

1. font size

I would like to know if I can increase the font size of the questionnaire.

1. randomization of participants

   I have the same questionnaire, in two different languages. Now, on the first page, there are two national flags standing for each language and participants can choose one at will.
   I want that my participants can be assigned randomly to one language on the first page rather than choose one at will.
   Is it possible?

Look forward to your reply! Thank you very much!

Answer 1

I would like to know if I can increase the font size of the questionnaire.

Please see Survey Layouts for detailed instructions.

I want that my participants can be assigned randomly to one language on the first page rather than choose one at will.

Sure, you do not confuse them by doing so? Reading a German invitation an then starting with an English questionnaire (or the other way around) may look like an error. You may have an introduction in the invitation language and then (depending on experimental group) explain what is ahead of them. You will also have to ensre that they speak the other language, or you will have a systematic dropout, confounding your experiment.

The randomization itseld then just requires a random generator and the function setLanguage() used in a IF filter.

And, of course, you'll have to set a default language in compose questionnaire -> settings.