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# 10-1-13 Unit 1 Review

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### 10-1-13 Unit 1 Review

1. 1. Unit 1 Test Review Conducting Experiments
2. 2. A Good Experiment • Tests one variable at a time. If more than one thing is tested at a time, it won’t be clear which variable caused the end result. • Must be fair and unbiased. This means that the experimenter must not allow his or her opinions to influence the experiment. • Does not allow any outside factors to affect the outcome of the experiment.
3. 3. Variables • A variable is anything in an experiment that can change or vary. • It is any factor that can have an effect on the outcome of the experiment. • There are three main types of variables.
4. 4. 3 Kinds of Variables Independent Variable (IV) – something that is intentionally changed by the scientist – What is tested – What is manipulated – Also called a “Manipulated Variable” – You can only change ONE variable in an experiment!!!
5. 5. 3 Kinds of Variables Independent Variable (IV) To determine the independent variable, ask yourself: “What is being changed?” Finish this sentence… “I will change the _____________”
6. 6. 3 Kinds of Variables Dependent Variable (DV) – something that might be affected by the change in the independent variable – What is observed and measured – The data collected during the investigation – Also called a “Responding Variable”
7. 7. 3 Kinds of Variables Dependent Variable (DV) To determine the dependent variable, ask yourself: “What will I measure and observe?” Finish this sentence… “I will measure and observe ________________”
8. 8. 3 Kinds of Variables Standardized Variable (SV) – a variable that is not changed and kept the same – Also called constants – Allows for a “fair test” – NOT the same as a “control”!! – Any given experiment will have many controlled variables
9. 9. 3 Kinds of Variables Standardized Variable (SV) To determine the controlled variables, ask yourself: “What should not be allowed to change?” Finish this sentence… “I will not allow the ______________ to change.”
10. 10. Observations • Observations must be taken in with one of the five senses – Touch – Sight – Taste – Sense – Smell
11. 11. Inferences • Inferences take observations and then draw conclusions about them
12. 12. Black Like Me (1961)
13. 13. The foundation of the experiment • The development of a hypothesis is the first step in designing and conducting an experiment. • The hypothesis should be: • clear, • specific, • and testable.
14. 14. Hypothesis Format • If the (independent variable) is (describe change) • Then the (dependent variable) will (describe change)
15. 15. Experiment title • Like your hypothesis, you also use a specific format on the title of your experiment • Your title also shows the relationship between the IV and DV
16. 16. The title of your experiment… • Is written in the following format: • “The Effect of (Independent Variable) on the (Dependent Variable).” • Remember, in your experiment, you are looking to see if the IV has an effect on the DV