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Writing a Hypothesis • What is a Real Hypothesis? • A possible explanation to some phenomenon or event • It must be testable! How are Hypotheses Written? These are all possible hypotheses: 1. Chocolate may cause pimples. 2. Salt in soil may affect plant growth. 3. Plant growth may be affected by the color of the light. 4. Bacterial growth may be affected by temperature. 5. Ultraviolet light may cause skin cancer. 6. Temperature may cause leaves to change color. • Using the word “may” does not tell us how we can go about testing the hypotheses Formalized Hypotheses • Use “if” and “then” statements Contain two variables 1. Independent (manipulated) 2. Dependent (responding) Independent Variable • The variable the scientist controls • Also called the manipulated variable Dependent Variable • The variable you observe or measure • Also called the responding variable If (responding variable) is related to (manipulated variable) then (prediction). Example • Skin cancer may be caused by ultraviolet light. Formal Hypothesis • If skin cancer is related ultraviolet light, then people with a high exposure to uv light will have a higher frequency of skin cancer. Example • Leaves may change color in the fall because of the temperature. Formal Hypothesis • If the color change in leaves is related to temperature, then exposing plants to low temperatures will result in the leaves changing colors.