<span>C. His father could not afford a college education for him</span>
We are alone living in this universe. So far we have not yet detected any civilization other than Earth. But assume that the possibility of having a civilization in a star in the Milky Way Galaxy over 5 billion years is 1 in million. We are going to find the time separation of each civilization if our galaxy has 100 billion stars.
The number of stars in the galaxy
The possibility of stars having civilization
It is not possible to make radio contact with another civilization, because our technology did not come to this far yet.
the rim of the Pacific plate where many earthquakes and volcanoes form
The answer is construct validity. This is used to associate and interrogation of causal claims. Through determining the variable, interrogation is already being done to see if the variables have an effect on what is being measured. This way construct validity is being done. Also, one variable can be studied in different angles to understand the degree of how it takes effect or how can it be associated.
Source
http://nortonbooks.typepad.com/files/research-methods-in-psychology-sample-chapter-3-1.pdf
He is widely regarded as the "father of experimental psychology". In 1879, at University of Leipzig, Wundt founded the first formal laboratory for psychological research.
