Vocabulary builder activity what does a historian do

A historian is a person that researches about the past. He has a methodical way to both find and narrate the information. He must be very objective and treat all evidence as important, without choosing any sides and without leaving anything to his personal interpretation.  

A historian should not only talk and research about the facts, but he should care about the motives of the historical actors.

The register of history has been in human life since the beginning on time and historians have existed since the old civilizations. Modern historians normally work at universities, museums or as writers.

answer; i believe the correct answer is (a) the correlation between the cause variable and outcome variable is zero;

b hope this