You test K = 1, 3, 5, 7, 9 using 5-fold cross-validation and get the following average accuracies: 89%, 92%, 94%, 93%, 88%. Which K should you select and why?

Question

Answer

K=5, because it achieves the highest cross-validated accuracy

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K=1, because it has the lowest bias

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K=3, because odd numbers are always preferred

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K=9, because larger K always generalises better

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You test K = 1, 3, 5, 7, 9 using 5-fold cross-validation and get the following a...

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