| A | B |
|---|
| hypothesis | A statement about an expected outcome that can be supported or refuted by the results of an experiment. e.g., CFCs slow ozone reformation. |
| prediction | An if/then statement allowing data to be compared to the hypothesis: e.g., if ClO is found in upper stratosphere, then CFCs slow ozone formation. If ClO is not found in the upper stratosphere, then CFCs do NOT slow ozone reformation. |
| independent variable | the single variable that is to differ between samples in an experiment. For example, include CFC in a container of ozone OR do NOT include CFC ina container of ozone. |
| dependent variable | The data measured in an experiment--the results of altering the independent variable. |
| controlled study | an experiment or observation where steps have been taken to have only one difference, the independent variable, between any samples. |
| data | the observations recorded in an experiment; may be qualitative or quantitative. The dependent variable. |
| controlled variables | every aspect of an experimental sample that is kept EXACTLY the same |
| uncontrolled study | an experiment whose results can not be interpretted meaningfully because factors in addition to the independent variable changed between samples |
| quantitative | measured numerically --like the color of the solution makes it absorb light best at 595 nm wavelength |
| qualitative | not measured numerically, like the color is dark blue |
