Generate a 95% confidence interval for the difference in mean ages between groups. Generate a 95% confidence interval for the difference in proportions of males between groups. Generate a 95% confidence interval for the difference in proportions of patients with severe migraine headaches between groups.
- The following data are collected from 10 randomly selected patients undergoing physical therapy following knee surgery. The data represent the percentage gain in the
range of motion after 3 weeks of therapy. Generate a 95% confidence interval for the mean percentage gain in the range of motion.
|
24% |
32% |
50% |
62% |
21% |
|
45% |
80% |
24% |
30% |
10% |
- The data in Table 6–27 are collected in a randomized trial to test the efficacy of a new drug for migraine headaches. The following are characteristics of study participants overall and then organized by the treatment to which they are assigned.
TABLE 6–27 Characteristics in Participants in Study of Treatment for Migraine Headaches
|
New Drug (n = 100) |
Placebo (n = 100) |
All (n = 200) |
|
|
Mean (SD) age, years |
32.8 (4.7) |
31.9 (5.1) |
32.0 (4.9) |
|
% Male |
54% |
48% |
51% |
|
% High school graduate |
76% |
80% |
78% |
|
Severity of migraine headaches |
|
|
|
|
% Mild |
22% |
20% |
21% |
|
% Moderate |
38% |
42% |
39% |
|
% Severe |
40% |
38% |
39% |
|
|
5 (3–12) |
6 (2–18) |
6 (3–17) |
|
Min–Max number of days missed work in past year due to migraine |
0–35 |
0–48 |
0–48 |
Generate a 95% confidence interval for the difference in mean ages between groups.
Generate a 95% confidence interval for the difference in proportions of males between groups.
Generate a 95% confidence interval for the difference in proportions of patients with severe migraine headaches between groups.
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