1. Independent variable: 2. Dependent variable:
3. Hypothesis:
C Abbey always gets zits on her chin and she can't figure out
the best method to get rid of them. She decides to test
several products to see which clears her face up fastest:
washing with soap and water, washing with an acne face
wash from the pharmacy, and washing her face with
organic oils. For one week she just washes her face with
water. The next week she washes every day with soap and
water. The following week she uses the acne wash, and
the last week she uses the organic oils. Each week she
records the number of zits she has on her chin at the end of
the day.
4. Control group:
5. Experimental group:
6. Constants:
7. Possible threats to accuracy of results? Read each scenario and answer the questions to the right