Answer:
The answer is a double-blind study.
Explanation:
A double-blind study is a research method in which neither the participants or the researchers are aware about which group is receiving the treatment. This is done in order to avoid biases such as the placebo effect, as well as preventing accidental cues given by the researchers.
The greatest advantage of this approach is its high validity.
The answer to this is about 36 percent.
The Wright brothers flew their first plane in 1903 and the first continental railroad opened in 1869 if you subtract those two you would get 34 years after
It includes the state senate and the state House of Representatives. It is similar to US congress.