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DefinitionCharacteristics Examples Nonexamples data Frayer, Frederick, & Klausmeier, 1969 Facts, figures, and other evidence collected in an experiment.

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Presentation on theme: "DefinitionCharacteristics Examples Nonexamples data Frayer, Frederick, & Klausmeier, 1969 Facts, figures, and other evidence collected in an experiment."— Presentation transcript:

1 DefinitionCharacteristics Examples Nonexamples data Frayer, Frederick, & Klausmeier, 1969 Facts, figures, and other evidence collected in an experiment. record data carefully permanent account of what happened in an experiment descriptions measurements International System of Units (metric system) data tables and graphs problem inference hypothesis

2 DefinitionCharacteristics ExamplesNonexamples Frayer, Frederick, & Klausmeier, 1969 Independent Variable The one factor that a scientist changes during an experiment; (also called the manipulated variable. ) Type of paper towel (Which type is more absorbent?) Amount of salt in water (Which will freeze faster, salt water or fresh water?) *see experiment on p of textbook Can only have 1 at a time in a controlled experiment The variable that stays the same The variable that changes because of another

3 DefinitionCharacteristics ExamplesNonexamples Frayer, Frederick, & Klausmeier, 1969 Dependent Variable The factor that changes as a RESULT of changes to the independent variable in an experiment. Independent variable Controlled variable Freezing temperature (changes because salt was added to the water) Amount of water absorbed (changes if one type of paper towel is more absorbent than another) *see experiment on p of textbook CAN change because of what the scientist DID to the independent variable Does not always have to change

4 DefinitionCharacteristics ExamplesNonexamples Frayer, Frederick, & Klausmeier, 1969 Controlled Variable The variable that stays the same throughout an experiment. There can be several controlled variables They don’t change during the experiment (kept the same on purpose) The amount of water, type of container, and temperature of the freezer in the saltwater experiment. *see experiment on p of textbook The amount of water and the time observed in the paper towel experiment. The variable that the scientist changes (independent variable) The variable that changes in response to another (dependent variable)


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