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 CR004003: An experiment in which the number of fish in a series of fish bowls is held constant and the temperature of the water in the fish bowls is varied could tell you the effect that water temperature has on the behavior of goldfish.
A student wants to find out if temperature affects the behavior of goldfish. He has four fish bowls and 20 goldfish. Which of the following experiments should he do?
- Distribution of Responses
- Students Responding Correctly
| Group | Correct | Total | Percent |
|---|---|---|---|
| Overall | 1881 | 2559 | 74% |
| Grades | |||
| 6–8 | 910 | 1383 | 66% |
| 9–12 | 962 | 1162 | 83% |
| Gender | |||
| Male | 899 | 1255 | 72% |
| Female | 965 | 1282 | 75% |
| Primary Language | |||
| English | 1645 | 2205 | 75% |
| Other | 210 | 315 | 67% |