Aresearcher administers a standardized test to the students in a school testing a new program as well as to students in a similar school as a control group. to what extent is comparison of the average scores for the two groups of students useful for determining the effects of the program? a. not at all useful, as it is not a true experimental design b. of limited usefulness as a pilot study but has many threats to validity c. very useful, as the similarity of the schools eliminates threats to validity d. a statistical regression is needed to determine its usefulness

It not a true experiment, not at all use.  

Explanation:

A true experiment is a type of experiment that is thought to be the most accurate type of experimental research. The true experiment supports the hypothesis using statistical analysis. We can be called that true experiment is the only experiment that works on cause and effect relationships.  

Example of the true experiment:

There is an example of placebo effects. There was two groups such as a control group and an experimental group. The control group received a placebo, that looks like medicine, not exactly a medicine. the people were just because they think they are receiving treatment. If the control group more reduction in anxiety than the experimental group then we can say that the placebo effect and reduction in anxiety are not caused by the drug.

answer; /// i believe that the correct answer is ; /// renaissance,printing press, age of exploration and protestant reformation;