Question

In the population below. What is the prevalence of hypertension among those who are not obese? Hypertension No Hypertension Total Obese 8254 1120 9374 Not Obese 3152 6374 9526 Total 11406 7494 18900

Answer 1

H0: There is no association between prevalence of hypertension among those who are not obese

H1: There is association between prevalence of hypertension among those who are not obese

Let the los be alpha = 5%

The expected frequencies are

	Obsese
	A	C	M	Total
Hypertension	5657.135	3716.865	9374	18748
No Hypertension	5748.865	3777.135	9526	19052
Total	11406	7494	18900	37800

The chisquare contribution values are

Oi	Ei	(Oi-Ei)^2 /Ei
8254	5657.135	1192.0712
1120	3716.865	1814.3537
9374	9374	0
3152	5748.865	1173.0503
6374	3777.135	1785.4029
9526	9526	0
	Total:	5964.8781

Degrees of freedom: 2

Test Statistic, X^2: 5964.8800
Critical X^2: 5.991471
P-Value: 0.0000

Here p-value < alpha 0.05 so we reject H0

Thus we conclude that There is association between prevalence of hypertension among those who are not obese