Question

key concepts
infer what kinds of scientific investigations involve making observations?
apply in an experiment, which variable changes in response to the manipulation of another variable?
explain when might a scientist use a model?
compare how are repetition and replication alike and different?
what is science
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Explanation:

1. Scientific investigations that involve making observations include field - work, laboratory experiments, and naturalistic observations. Scientists observe phenomena to gather data.
2. In an experiment, the dependent variable changes in response to the manipulation of the independent variable. The independent variable is the one the experimenter changes.
3. A scientist might use a model when the real - world system is too large, too small, too complex, or too dangerous to study directly. Models can be physical, mathematical, or conceptual.
4. Repetition and replication are alike in that they both involve doing an experiment multiple times. Repetition is when the same experimenter repeats an experiment in the same laboratory. Replication is when different experimenters repeat an experiment in different laboratories.

Answer:

1. Field - work, laboratory experiments, naturalistic observations.
2. Dependent variable.
3. When the real - world system is too large, too small, too complex, or too dangerous to study directly.
4. Alike: Both involve doing an experiment multiple times. Different: Repetition is by the same experimenter in the same lab; replication is by different experimenters in different labs.