According to research presented in the text, students shot a roll of film and printed two photographs. some were told that they could exchange the one they chose to keep within five days, but others were told that their choice was final. what was the independent variable of this experiment

The independent variable would be the photographs. The independent variable is the variable that is not affected by any changes in any variable. In this case, the photos remains constant no matter how the much the students like each. The dependent variable will be the degree of likeness the student has for the photos.