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## Final Exam Review 1. **For each of the ideas, write a specific question that will lead directly to the further steps in the scientific method.** Remember, the proper wording format for a scientific investigative question is: What is the effect of increasing/decreasing the \_\_\_\_\_\_\_\_\_\_\_...

## Final Exam Review 1. **For each of the ideas, write a specific question that will lead directly to the further steps in the scientific method.** Remember, the proper wording format for a scientific investigative question is: What is the effect of increasing/decreasing the \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ on the \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_? * **IDEA:** stretching an elastic band **Possible Question:** What is the effect of increasing the amount you stretch a rubber band on the amount it stretches the next time you stretch it? * **IDEA:** the pitch of the sound from a trumpet **Possible Question:** What is the effect of increasing the amount of air going into the trumpet on the pitch it makes? * **IDEA:** lighting a candle **Possible Question:** What is the effect of decreasing the amount of wicks lit on the seed that the candle melts? 2. **Identify the following independent variables, dependent variables and 3 controlled variables that they could use in the experiment.** * **a. What is the effect of light intensity on pupil size?** * **IV:** light intensity * **DV:** pupil size * **CV:** * Distance from the light source * Time of day * Age of the subject * **b. What is the effect of increased driving speed on gasoline consumption?** * **IV:** increased driving speed * **DV:** gasoline consumption * **CV:** * Type of vehicle * Road conditions * Amount of cargo being carried * **c. What is the effect of increasing the frequency on teeth brushing on the amount of plaque buildup?** * **IV:** increasing the frequency of teeth brushing * **DV:** amount of plaque buildup * **CV:** * Type of toothbrush * Brand of toothpaste * Amount of food consumed 3. **Jim thinks that red lights will cause plants to grow faster than plants that are not exposed to red lights. He grows 10 plants exposed to red light for 1 month and compared these to 10 plants that were not exposed to red light. He found that 1 of the 10 plants were taller than the plants that were not exposed.** * **a. Control Group:** plants that were not exposed to red light * **b. Independent variable:** red light * **c. Dependent variable:** plant height * **d. What should Jim's conclusion be?** Jim's conclusion should be that red light does not necessarily cause plants to grow faster than plants that are not exposed to red light. The evidence is not conclusive, as only one plant out of ten in the red-light group grew taller than any of the control group. A larger sample size may be needed to draw a more reliable conclusion.