Professor binkie has been studying how playing video games affects a student's performance on the sat. using 5,000 students, the professor is monitoring the amount of time they play the video games and how they score on the test. which of these would be a variable that professor binkie would be unable to control during his research? a) total number of students b) numbers of boys and girls c) what date they will take the sat d) how hard the students try on the sat