Among the alternatives to the traditional F test when the sphericity assumption is violated,two of the most frequently encountered adjustment factors are the Huyhn-Feldt epsilon and the Greenhouse-Geisser epsilon.

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This statement is true. Both Huyhn-Feldt epsilon and Greenhouse-Geisser epsilon are commonly used adjustment factors when the sphericity assumption is violated. These adjustments help compensate for the bias that can arise when using the F test in such situations.

Among the Alternatives to the Traditional F Test When the Sphericity