Which type of research involves collecting data from a sample of people on a single occasion, with the goal of examining those data for relationships between variables in the data, based on the hypotheses of the study?

Currently, as of february 2016, an american traveling in france would be by the exchange rate. the weakness of the euro and the strength of the us dollar means that items in france cost less to an american than they otherwise would. of course, if this trend reverses and the us dollar weakens and the euro strengthens, such as was happening in early 2008, an american traveling in france would have an adverse experience because items would cost relatively more.