Q. When citing a study in a research paper does the cited information go at the end of the sentence?

From our guide for APA citation/style (link below):

When you paraphrase (put into your own words) ideas from another author's work, you still need to cite it. All that is required is a reference to the author and year of publication. It is possible that your instructor might also require page number, so be sure to check.

Example:

Though most teens belong to at least one social site, there is very little peer reviewed research on the topic (Thompson, 2012).