A study of the effects of smoking on sleep patterns is conducted. The measure observed is the time, in minutes, that it takes to fall asleep.
These data are obtained:
|
Smokers:
|
69.3
|
56.0
|
22.1
|
47.6
|
|
|
53.2
|
48.1
|
52.7
|
34.4
|
|
|
60.2
|
43.8
|
23.2
|
13.8
|
|
Nonsmokers:
|
28.6
|
25.1
|
26.4
|
34.9
|
|
|
29.8
|
28.4
|
38.5
|
30.2
|
|
|
30.6
|
31.8
|
41.6
|
21.1
|
|
|
36.0
|
37.9
|
13.9
|
|
(a) Find the sample mean for each group.
(b) Find the sample standard deviation for each group.
(c) Make a dot plot of the data sets A and B on the same line.
(d) Comment on what kind of impact smoking appears to have on the time required to fall asleep.