The following data come from a study that examines the efficacy of saliva cotini
ID: 3382529 • Letter: T
Question
The following data come from a study that examines the efficacy of saliva cotinine as an indicator for exposure to tobacco smoke. In one part of the study, seven subjects - none of whom were heavy smokers and all of the whom has abstained from smoking for at least one week prior to the study - were each required to smoke a single cigarette. Samples of saliva were taken from all individuals 2, 12, 24, and 48 hours after smoking the cigarette. The cotinine levels at 12 hours and at 24 hours are shown below.
Subject
Cotinine levels (nmol/l)
After 12 Hours
After 24 Hours
1
2
3
4
5
6
7
73
58
67
93
33
18
147
24
27
49
59
0
11
43
Let µ12 represent the population mean cotinine level 12 hours after smoking the cigarette and µ24 the mean cotinine level 24 hours after smoking. It is believed that µ24 must be lower than µ12.
(a) Construct a one-sided 95% confidence interval for the truth difference in population mean µ12 - µ24.
(b) Test the null hypothesis that the population means are identical at the ? = 0.05 level of significance. What do you conclude?
Note:
Subject
Cotinine levels (nmol/l)
After 12 Hours
After 24 Hours
1
2
3
4
5
6
7
73
58
67
93
33
18
147
24
27
49
59
0
11
43
Explanation / Answer
The following data come from a study that examines the efficacy of saliva cotini
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