Use this table to answer the following questions:

	Text Message	X2	Video Chat	X2	Phone Conversation	X2
	6		20		4
	3		15		7
	7		12		15
	8		11		12
	9		15		13
	5		17		11
	6		9		8
	5		4		14
	9		12		9
	4		19		11
n							N
X							X
X							(X)2/N
(X2)							(X2)
(X)2/n							(X)2/n