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Atticus had Mr. Ewell write his name to show that he was left-handed.
The girl was beaten by someone who lead with his/her left hand.
Tom Robinson could not even use his left hand, therefore he could not have beaten her; just proving further that the trail was a farce. Atticus was trying to suggest that it was Mr. Ewell who beat Mayella, not Tom. Mr. Ewell was left-handed, and Tom couldn't even use his left-hand. Atticus then proceeds to question Mayella about her home life*, further driving his point home.