9) Researchers are interested in studying the health effects of 1-bromopropane, a solvent touted as a"green replacement" for ozone-depleting chemicals which has been shown in laboratory studies to bea potential lung carcinogen. Although it is commonly used in several commercial industries, highlevels of exposure, of the magnitude required to cause cancer in model organisms, are rare in thegeneral population. If we consider lung cancer to be a relatively common outcome, which of thefollowing study designs would be most appropriate for determining whether 1-bromopropane isassociated with lung cancer risk:a) Cross-sectional studyb) Cohort studyc) Experimental studyd) Ecologic studye) Case-control study10) What is the null hypothesis for the study described above (Question 9)?

9) Cohort study refers to the study of subjects to determine whether the factor of interest is…

Answered: 9) Researchers are interested in…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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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. What are the 3 null hypotheses are being tested in the ANOVA? 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? Source df F P Rat type 1…
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