posted by Anonymous .
Discuss three factors that a researcher can control when designing a valid study and three factors that a researcher can control to limit the effects that extraneous variables can have on the results of a study
Gender, age, education, socioeconomic status. Do you want more?
I searched Google under the key words "experiment extraneous variables" to get this:
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.