Free STEMscopes Scientific Inquiry and Methodology Questions and Answers — Questions and Answers
Question 1: What is a hypothesis?
- A proven fact
- A testable prediction (Correct answer)
- An established theory
- A conclusion drawn from data
Correct answer: A testable prediction
A hypothesis is a testable prediction or a proposed explanation for an observation or phenomenon. It is typically formulated as an 'if-then' statement and serves as a starting point for scientific investigation. A hypothesis is not a proven fact but rather an educated guess that can be supported or refuted through experimentation and data collection.
Question 2: In an experiment, what is the independent variable?
- The variable that is measured or observed
- The variable that is kept constant
- The variable that is changed or manipulated (Correct answer)
- The variable that is not important
Correct answer: The variable that is changed or manipulated
In an experiment, the independent variable is the factor that the experimenter intentionally changes or manipulates. It is the 'cause' in a cause-and-effect relationship being investigated. By altering this variable, researchers aim to observe its effect on the dependent variable.
Question 3: What is the dependent variable in an experiment?
- The variable that is manipulated
- The outcome that is measured (Correct answer)
- The variable kept constant
- The factor that is observed
Correct answer: The outcome that is measured
The dependent variable in an experiment is the outcome that is measured or observed. It is the 'effect' that responds to changes in the independent variable. Researchers analyze the changes in the dependent variable to draw conclusions about the impact of the manipulated independent variable.
Question 4: Why is it important to have a control group in an experiment?
- To introduce new variables for comparison
- To ensure that the experiment has no independent variable
- To provide a baseline for comparison with the experimental group (Correct answer)
- To make the experiment more complex
Correct answer: To provide a baseline for comparison with the experimental group
A control group is essential in an experiment because it provides a baseline for comparison with the experimental group. The control group does not receive the treatment or manipulation of the independent variable. This allows researchers to isolate the effect of the independent variable, ensuring that any observed changes in the experimental group are indeed due to the variable being tested and not other extraneous factors.
Free STEMscopes Scientific Inquiry and Methodology Questions and Answers
What is a hypothesis?