Concept Review
Review Questions
Question 1
What is the purpose of a control group?
Question 2
Define independent variable.
Question 3
Define dependent variable.
Question 4
What are controlled variables (constants)?
Question 5
What is a hypothesis?
Question 6
Why is it important to repeat experiments multiple times?
Question 7
What is the difference between qualitative and quantitative data?
Question 8
What makes an experiment fair?
Question 9
What should you do if your results don't support your hypothesis?
Question 10
Why is a sample size important in experiments?
Answers
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1. To provide a baseline for comparison, showing what happens without the treatment
2. The variable the scientist changes or manipulates on purpose
3. The variable that is measured; it responds to changes in the independent variable
4. Variables kept the same throughout the experiment to ensure fair testing
5. A testable prediction about the outcome of an experiment
6. To ensure results are reliable and not due to chance
7. Qualitative: descriptive (color, smell); Quantitative: numerical (measured with numbers)
8. Only one variable changes; all others stay constant
9. Report the actual results honestly; revise hypothesis and test again
10. Larger samples give more reliable results and reduce the effect of outliers