$\begin{array}{ccccc}\hline \text { Diameter } &{\text { Head Roughness }} \\\hline 16 & 19.8 & 25.9 & 17.5 & 23.2 \\24 & 31.9 & 33.0 & 27.7 & \\30 & 26.6 & 28.8 & 21.2 & \\\hline\end{array}$

Perform the Tukey-Kramer test to determine which pairs of means, if any, differ. Use the $\alpha = 0.05$ level of significance.

A) $\mu _ { 16 } \neq \mu _ { 24 }$

B) $\mu _ { 16 } \neq \mu _ { 24 } , \mu _ { 16 } \neq \mu _ { 30 }$

C) $\mu _ { 16 } \neq \mu _ { 24 } , \mu _ { 24 } \neq \mu _ { 30 }$

D) There is not enough evidence to conclude that any of the means differ.

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