Original Project
Control of Variables
If more than one variable changes at the same time in an experiment, the outcome of the experiment may not be cl…
Item CR019004: In a controlled experiment, the variable of interest is allowed to change. (Follow up to CR019002)
For the question above (CR019002), why did you choose that answer?
A. Because I already know what affects the floating of the boats.
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 student decided to include in this experiment.
- Distribution of Responses
- Students Responding Correctly
| Group | Correct | Total | Percent |
|---|---|---|---|
| Overall | 1369 | 2557 | 54% |
| Grades | |||
| 6–8 | 595 | 1377 | 43% |
| 9–12 | 765 | 1166 | 66% |
| Gender | |||
| Male | 617 | 1260 | 49% |
| Female | 739 | 1275 | 58% |
| Primary Language | |||
| English | 1219 | 2201 | 55% |
| Other | 126 | 317 | 40% |
- None identified