False they don't have to be clearly just has long as you have them so my teacher says!
Answer:
2 Characteristics:
1st.-He has ascertained 3 letters of recommendation and
2nd. -He has not yet proposed to his girlfriend.
Explanation:
Both could have several results according to the continuos variable definition.
On the other hand:
1st.-having earned a undergraduate degree is a concrete variable as well as... 2nd.- applied to medical school is also certain and concrete.
President John F. Kennedy eloquently evoked this principle in his 1963 address to the nation, following the court-order