To analyze tone, you should study connotations, diction, the speaker and the topic. It is important to think about the connotations given with certain words, whether words are angry or happy. Additionally, the diction can provide input, if they are dropping words or speaking quickly. The speaker can also help provide the tone, you have associations with certain people, like a funeral attendant being somber. Finally, the topic can also tell you the tone, if you're reading about a funeral, you would expect the tone to be sad.