a. What is the sensitivity of this test? b. What is the specificity of this test? c. Suppose your grandmother receives a negative test result. What are the chances that she actually has dementia?
a. What is the sensitivity of this test? b. What is the specificity of this test? c. Suppose your grandmother receives a negative test result. What are the chances that she actually has dementia?
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.6: Summarizing Categorical Data
Problem 30PPS
Related questions
Question
![2. The Chinese Mini-Mental Status Test (CMMS) consists of 114 items intended to identify people with
Alzheimer's disease and senile dementia among people in China. An extensive clinical evaluation of this
instrument was performed, whereby participants were interviewed by psychiatrists and nurses and a
definitive diagnosis of d+nentia was made. The table below shows the results of the study.
CMMS score
No Dementia
Dementia
0-5
6-10
11-15
16-20
21-25
26-30
Total
0
0
3
9
16
18
46
2
1
4
5
3
1
16
Suppose a cutoff value of ≤ 20 on the test is used to identify people with dementia. Further assume the
rate of dementia in the population of interest is approximately 10%.
a. What is the sensitivity of this test?
b.
What is the specificity of this test?
c. Suppose your grandmother receives a negative test result. What are the chances that she
actually has dementia?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fff0b45d0-95e9-4516-aa8d-2049cab09c1c%2Fb2a4687f-d7c3-41a1-83b8-37a6430f32c3%2F4k4l898_processed.png&w=3840&q=75)
Transcribed Image Text:2. The Chinese Mini-Mental Status Test (CMMS) consists of 114 items intended to identify people with
Alzheimer's disease and senile dementia among people in China. An extensive clinical evaluation of this
instrument was performed, whereby participants were interviewed by psychiatrists and nurses and a
definitive diagnosis of d+nentia was made. The table below shows the results of the study.
CMMS score
No Dementia
Dementia
0-5
6-10
11-15
16-20
21-25
26-30
Total
0
0
3
9
16
18
46
2
1
4
5
3
1
16
Suppose a cutoff value of ≤ 20 on the test is used to identify people with dementia. Further assume the
rate of dementia in the population of interest is approximately 10%.
a. What is the sensitivity of this test?
b.
What is the specificity of this test?
c. Suppose your grandmother receives a negative test result. What are the chances that she
actually has dementia?
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Hi, I don't think you answered part c at all. Wouldn't you have to calculate the NPV? The ngeative predictive value?
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