| A | B |
|---|
| response variable | a variable that measures an outcome or result of a study |
| explanatory variable | a variable that we think explains or causes changes in the respones variables |
| treatment | any specific experimental condition applied to the subjects |
| lurking variable | a variable that has an important effect on the relationship among the variable in a study but is not of the explanatory variables studied |
| confounded | two variables are confounded when their effects on a responde variable cannot be distinguished from each other - they may be either explanatory or lurking variables |
| placebo | dummy treatment |
| placebo effect | response to a dummy treatment |
| placebo group | control group |
| randomized comparative experiment | compares just two treatments |
| randomize | use impersonal chance to assign subjects to treatments |
| statistically significant | an observed efect so large that it would rarely occur by chance |
| nonadherers | subject who praticpate but don't follow the experimental treatment |
| dropouts | subjects who begin the experiment but do not coplet it |
| matched pairs design | combines matching with randomization |
| block design | the random assignment of subjects to treatments within each block |
| block | group of experimental subjects that are know before teh experiment to be similar in some way that is expected to affect the response to the treatments |
