exam Maths Puzzle Numerical Ability

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I need help with the following, please!!!

Determine whether 3sqrt-8/27 is rational or irrational

Thank you. Given the following sample information, test the hypothesis that the treatment means are equal at the .05 significance level.

TREATMENT 1: 8, 11, 10
TREATMENT 2: 3, 2, 1, 3, 2