Compare and contrast the fundamental differences in size and function between a grand jury and a petit jury

Compare and contrast the fundamental differences in size and function between a grand jury and a petit jury. 
 

Use the Internet or Strayer Library to research one (1) case in which a grand jury was convened from your home state, and one (1) case in which a petit jury was convened from your home state.
 

Explain the major distinctions between the two (2) cases you chose.