title: When is Multiple Comparison Correction necessary?
body: <p>I am not very experienced in hypothesis testing and have a problem understanding when Multiple Comparison Problem  occurs? </p>
  
  <p>As I Understood Multiple Comparison Problem occurs when one tries to perform several statistical tests from a single database. Therefore, in order to draw right conclusions, the significance level should be adjusted. (Am I right?)</p>
  
  <p>In my situation, I have a database and I perform several t-tests on separate parts of the database. In other words, the data of each test is completely distinct from the other test, while all data belong to one database. So, in principle multiple comparison problem should not exist in my tests, is it right?</p>
  
  <p>Thanks in Advance.</p>