when the conditions of a study resemble or approximate only the conditions of interest, questions may raised about the___of the study.

A. External B. interrnal C. standardization D. randomization

Iam tinking it is C.standardization
can I get heip or a web site. Thanks

2 answers

I agree with your answer.
And I agree with Ms. Sue. The other choices don't fit.

I searched Google under the key words "experimental standardization" to get this:

http://www.google.com/search?client=safari&rls=en&q=experimental+standardization&ie=UTF-8&oe=UTF-8

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/.