Chapter 9.3, Problem 5Q

Raynaud’s syndrome is characterized by the sudden impairment of blood circulation in the fingers, a condition that results in discoloration and heat loss. The magnitude of the problem is evidenced in the following data, where twenty subjects (ten “normals” and ten with Raynaud’s syndrome) immersed their right forefingers in water kept at 19◦C. The heat output (in cal/cm2/minute) of the fore-finger was then measured with a calorimeter $\left(112\right)$.

Normal Subject		Subjects with Raynaud’s Syndrome
Patient	Heat Output $\left({\text{cal/cm}}^2\text{/min}\right)$	Patient	Heat Output $\left({\text{cal/cm}}^2\text{/min}\right)$
W.K.	2.43	R.A.	0.81
M.N.	1.83	R.M.	0.70
S.A.	2.43	F.M.	0.74
Z.K.	2.70	K.A.	0.36
J.H.	1.88	H.M.	0.75
J.G.	1.96	S.M.	0.56
G.K.	1.53	R.M.	0.65
A.S.	2.08	G.E.	0.87
T.E.	1.85	B.W.	0.40
L.F.	2.44	N.E.	0.31
	$\bar{x}=2.11$		$\bar{y}=0.62$
	$s_X=0.37$		$s_Y=0.20$

Test that the heat-output variances for normal subjects and those with Raynaud’s syndrome are the same. Use a two-sided alternative and the 0.05 level of significance.