The effects of caffeine become apparent with doses as small as the amount found in about one-half cup of brewed coffee, which is milligrams

The cerebral cortex is made up of two types of tissue – grey matter and black matter

Indicate whether this statement is true or false.

In terms of causation, under what circumstances does a correlation indicate causation?

If the correlation coefficient is positive If the correlation coefficient is significant If the correlation is negative By itself, it never indicates causation