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             ___     _____     __   __    ______  
  ____      / _ \\  |  __ \\   \ \\/ //  /_____// 
 |    \\   / //\ \\ | |  \ ||   \ ` //   `____ `  
 | [] ||  |  ___  ||| |__/ ||    | ||    /___//   
 |  __//  |_||  |_|||_____//     |_||    `__ `    
 |_|`-`   `-`   `-`  -----`      `-`'    /_//     
 `-`                                     `-`

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Text this: Effects of heterogeneous variance on X̄ chart