## Item CR017002: A controlled experiment involving the behavior of fish in fish bowls, in which the number of fish in the bowls varies and the temperature of the water and the amount of light is held constant, allows you find out the effect of the number of fish on fish behavior.

A student is interested in the behavior of fish. He has 4 fish bowls and 20 goldfish. He puts 8 fish in the first bowl, 6 fish in the second bowl, 4 fish in the third bowl and 2 fish in the fourth bowl.He places each fish bowl under light, he keeps the temperature at 75°F for all four bowls, and he observes the behavior of the fish.

What can the student find out from doing just this experiment?

- If the number of fish in the fish bowl affects the behavior of the fish.
- If the temperature of the fish bowl affects the behavior of the fish.
- If the temperature of the fish bowl and the amount of light affect the behavior of the fish.
- If the number of fish, the temperature, and the amount of light affect the behavior of the fish.

- Distribution of Responses

- Students Responding Correctly

Group | Correct | Total | Percent |
---|---|---|---|

Overall | 2355 | 5054 | 47% |

Grades | |||

6–8 | 1042 | 2793 | 37% |

9–12 | 1300 | 2238 | 58% |

Gender | |||

Male | 1142 | 2484 | 46% |

Female | 1183 | 2509 | 47% |

Primary Language | |||

English | 2106 | 4346 | 48% |

Other | 195 | 604 | 32% |