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  _____     _____   __    __     ___     _    _   
 |__  //   |  ___|| \ \\ / //   / _ \\  | |  | || 
   / //    | ||__    \ \/ //   / //\ \\ | |/\| || 
  / //__   | ||__     \  //   |  ___  |||  /\  || 
 /_____||  |_____||    \//    |_||  |_|||_// \_|| 
 `-----`   `-----`      `     `-`   `-` `-`   `-`

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發送短信 : Effects of heterogeneous variance on X̄ chart