Original Project
Control of Variables
Item CR018004: In a controlled experiment, the variable of interest is allowed to change. (Follow up to CR018002)
For the question above (CR018002), why did you choose that answer?
A. Because I already know what affects how long it takes them to dry.
B. Because that is what is allowed to change in this experiment.
C. Because that is what stays the same in this experiment.
D. Because that is what the team decided to include in this experiment.
- Distribution of Responses
- Students Responding Correctly
| Group | Correct | Total | Percent |
|---|---|---|---|
| Overall | 1153 | 2360 | 49% |
| Grades | |||
| 6–8 | 530 | 1278 | 41% |
| 9–12 | 620 | 1073 | 58% |
| Gender | |||
| Male | 546 | 1157 | 47% |
| Female | 590 | 1166 | 51% |
| Primary Language | |||
| English | 1031 | 2071 | 50% |
| Other | 89 | 228 | 39% |
- None identified