Question: When SPT N - values are obtained from 2 0 feet of depth of soil, raw N - value data should be corrected because of

When SPT N-values are obtained from 20 feet of depth of soil, raw N-value data should be corrected because of _______. Assuming that there is no groundwater effect.
Group of answer choices
Tube thickness correction
Overburden pressure
Friction
Density

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