Problem 11BSC

Determining Whether Events Are Disjoint. For Exercise, determine whether the two events are disjoint for a single trial. (Hint: Consider “disjoint” to be equivalent to “separate” or “not overlapping.”)

Randomly selecting a drug screening result and getting one that is a false positive.

Randomly selecting a drug screening result and getting one from someone who does not use drugs.

Solution 11BSC

A person who is not a drug user can get the result false positive. So events ‘Randomly selecting a drug is screening result and getting one that is a false positive’ and ‘Randomly selecting a drug screening result and getting one from someone who does not use drug.’ can occur simultaneously. Hence events are not disjoint.