Question

14 a type of investigation that allows scientists to control variables is a(n) _____________.
15 scientific experiments test relationships between ___________ and ___________ variables.
16 a scientific hypothesis must be _____________.
vocabulary
fill in the blank with the term that best completes the following sentences.
1 a scientific _____________ is a proposed explanation that can be tested.
2 a(n) _____________ is the factor that is deliberately changed in an experiment.
3 the information gathered in an investigation is called _____________.
4 a(n) _____________ should have only one independent variable.
5 _____________ can be made in the field or in the laboratory.
key concepts
6 infer what kinds of scientific investigations involve making observations?
7 apply in an experiment, how can a scientist tell if changes in the dependent variable are caused by changes in the independent variable?

Explanation:

1. A controlled experiment allows scientists to control variables.
2. Scientific experiments test relationships between independent and dependent variables.
3. A scientific hypothesis must be testable.

Answer:

1. controlled experiment
2. independent; dependent
3. testable