What are the two types of statistic

According to eric shlosser’s introduction to fast food nation what is his book primarily about?

Which tone best fits a business letter

You suspect that this article has left out some facts that might lead the reader to believe that someone else made the star-spangled banner. what is the best way to verify this? by consulting a variety of sources by disregarding the article entirely by writing a letter to the editor of the publication that printed the article by reading various historical accounts by verifying the opinions