Alternative Hypothesis: High school chemistry students who participate in a standard chemistry curriculum that is augmented with intelligent computer-based chemistry tutors will demonstrate higher chemistry achievement, as measured by higher scores on a standardized achievement test, when compared to students receiving only the standard chemistry curriculum. Which one of the following items best describes the independent variable in the alternative hypothesis stated above?

Group of answer choices

high school chemistry curriculum

science achievement

intelligent computer-based chemistry tutors

high school chemistry students

standard science curriculum