19. When the interest is to determine if a relationship between two variables exists, which of the following graphs is more appropriate?

	A.	Bar graph
	B.	Ogive
	C.	Histogram
	D.	Scatter Plot

21. The third quartile (Q3) of data on ages of students in a college is found to be 26. Which of the following is true?

	A.	50% of the students in this college are younger than 26 years
	B.	75% of the students in this college are older than 26 years
	C.	75% of the students in this college are younger than 26 years
	D.	50% of the students in this college are older than 26 years