Question

Please assist with the question highlighted in yellow.

AGE GROUP MEDIA Local TV National TV Radio Local newspaper Internet 50+ 138 129 108 108 Under 36 101 73 75 54 94 36-50 118 102 97 81 85

Answer 1

applying chi square test of independence:

Observed	OBS	<36	36-50	>50	Total
	lcoal TV	101	118	138	357
	national TV	73	102	129	304
	radio	75	97	108	280
	newspaper	54	81	108	243
	local newspaper	94	85	77	256
	Total	397	483	560	1440
Expected	Ei=?row*?column/?total	<36	36-50	>50	Total
	lcoal TV	98.423	119.744	138.833	357
	national TV	83.811	101.967	118.222	304
	radio	77.194	93.917	108.889	280
	newspaper	66.994	81.506	94.500	243
	local newspaper	70.578	85.867	99.556	256
	Total	397	483	560	1440
chi square	=(Oi-Ei)2/Ei	<36	36-50	>50	Total
	lcoal TV	0.07	0.03	0.01	0.10
	national TV	1.39	0.000	0.983	2.38
	radio	0.06	0.101	0.007	0.17
	newspaper	2.52	0.003	1.929	4.45
	local newspaper	7.77	0.009	5.110	12.89
	Total	11.82	0.14	8.03	19.990

$\chi ^{2}$ _stat =19.990