7. Letters to the editor Newspaper readers sometimes write letters to the
editor, hoping that their opinions will be published in the paper. The
editorial staff at a local newspaper keeps track of the content of each letter
that is submitted. After a controversial decision made by the mayor, 90% of
the letters to the editor expressed opposition to the mayor's action. Explain
why this sampling method is biased. Is 90% likely greater than or less than
the percentage of all citizens who oppose the mayor's action?