An argument concludes that a training scheme works, because staff who took it perform better. What assumption does this rely on?
If stronger staff self-selected into the training, their better performance could have nothing to do with it. Spotting self-selection is one of the most-tested ideas on the GMAT.
Q10Quantitative
If 2ˣ = 32, what is the value of x?
32 = 2 × 2 × 2 × 2 × 2, which is 2⁵, so x = 5. Answering 16 means you halved 32 instead of taking the power.