The covariance method of traditional inductive logic means that if only one situation changes in several occasions when the phenomenon under study changes, the only change is the cause or result of the phenomenon under study.
According to the above definition, which of the followings applies the covariance method?
The drugs of a pharmaceutical factory are tried by 1000 people of different genders, ages and physical conditions. No one has side effects. Therefore, taking this drug will not produce side effects.