The Following table presents measurements of head roughness (in nanometers). Diameter                   Head Roughness 16                              0.83    2.25   0.40    2.78     3.23 28                             2.72     2.48    3.80  36                              6.49     5.32    4.59 a. Using this data perform the Turkey-Kramer test to determine which pairs of means, if any, differ. Use the a=0.01 level of significance. a.

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