Answered: Researchers have suggested that sleep…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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Researchers have suggested that sleep apnoea (the tendency to occasionally stop breathing when asleep) may worsen the effects of allergen-induced asthma. To investigate this possibility, Johnson and colleagues (2015), compared two groups of rats, a normal healthy non-allergic group, and a second group that were mildly allergic to ovalbumin. They subjected these rats to one of two treatments – 1) a 10-minute period of induced hypoxia (oxygen down to 10% of the air), representing the kind of temporary hypoxia that sufferers of sleep apnoea may be subjected to, and 2) a control (normal air) group. They then compared the respiratory function of both groups in these two treatments by using a two-factor ANOVA. (Questions are on the next page).

Source	df	F	P
Rat type	1	21.88	<0.0001
Oxygen treatment	1	141.13	<0.0001
Rat type x oxygen treatment	1	15.68	<0.001
Residual	36

What is the result of the test of the interaction effect from this analysis?
What would be the most correct interpretation this result, based on the plot of means?

mean of PeakRespiration Flow
10
6
8
7
9
5
Allergic
Plot of Means
-L-
Het
Nonallergic
RatType
Treatment
Hypoxia
A- Normal

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