Exercise 3.24:
People suffering from Alzheimer's disease often have difficulty performing
basic activities of daily living (ADLs). In one study ("Functional Status
and Clinical Findings in Patients with Alzheimer's Disease," Journal of
Gerontology [1992]: 177-182), investigators focused on six such
activities: dressing, bathing, transferring, toileting, walking, and
eating. Here are data on the number of ADL impairments for each of 240
patients:
| Number of impairments |
0 |
1 |
2 |
3 |
4 |
5 |
6 |
| Frequency |
100 |
43 |
36 |
17 |
24 |
9 |
11 |
a. Determine the relative frequencies that correspond to the given
frequencies.
b. What proprtion of these patients had at most two impairments?
c. Use the result of Part (b) to determine what proportion of patients had
more than two impairments.
d. What proportion of ther patients had at least four impairments?
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