Problem
Mere exposure is the psychological phenomenon that states people prefer familiar stimuli to new stimuli when given a choice. A researcher asks 25 participants to repeatedly read words in "Foreign language A" and asks 25 other participants to repeatedly read words in "Foreign language B", then asks all participants to rate how much they like various words from both languages using a series of Likert scale questions. What is the sample size of this study? What is the Independent Variable?