Question

A dataset of 1000 samples is used for 5-fold cross-validation. How many samples are in each fold's test set, and how many times is any single sample used as part of a test set across the entire procedure?

A 500 samples per fold; used as test data once
B 200 samples per fold; used as test data 5 times
C 100 samples per fold; used as test data once
D 200 samples per fold; used as test data once
E 1000 samples per fold; used as test data 5 times
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