A research study examining how temperature effected problem solving scores by comparing problem solving in cool, moderate, and warm conditions can be called a __.

The answer is single-factor design.

Explanation:

As the name suggests, single-factor designs seek to study the effects of one independent variable on a dependent variable. The independent variable may be tested on different degrees in order to analyse the direct correlation between both variables.

Single-factor design usually has a preconceived hypothesis before the experiments are carried out.