| A | B |
|---|
| Confounding variable | occurs when an experimenter cannot tell the difference between the effects of different factors on a variable. |
| Placebo effect | occurs when a subject reacts favorably to a placebo when in fact, he/she has been given no medicated treatment at all. |
| Blinding | a technique where the subject does not know whether he or she is receiving a treatment or a placebo. |
| Double-blind experiment | neither the subject nor the experimenter knows if the subject is receiving a treatment or a placebo. |
| Randomization | process of randomly assigning subjects to different treatment groups. |
| Replication | is the repetition of an experiment using a large group of subjects. |
| Census | a count or measure of an entire popualtion |
| Sampling | a count or measure of part of a population. |
| Sampling error | the difference between the results of a sample and those of the population. |
| Random Sample | every member of the population has an equal chance of being selected. |
| Simple Random Sample | a sample in which every possible sample of the same size has the same chance of being selected. |
| Biased Sample | a sample that is not representative fo the population from which it is drawn. |
