Is there an error with CFA L2 book or am I wrong?

There seems to be an inconsistency between the formula in the CFA book and the examples for the Cook’s Distance. The sqrt(k/n) gives me a different answer than the ones given in the text book.

In both those examples, the numerical values they give (0.7303 and 0.679) seem to be 2 x sqrt(k/n) rather than sqrt(k/n).

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