2. The Chinese Mini-Mental Status Test (CMMS) consists of 114 items intended to identify people withAlzheimer's disease and senile dementia among people in China. An extensive clinical evaluation of thisinstrument was performed, whereby participants were interviewed by psychiatrists and nurses and adefinitive diagnosis of d+nentia was made. The table below shows the results of the study.CMMS scoreNo DementiaDementia0-56-1011-1516-2021-2526-30Total003916184621453116Suppose a cutoff value of ≤ 20 on the test is used to identify people with dementia. Further assume therate 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 sheactually has dementia?

Answered: a. What is the sensitivity of this…

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 First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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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?

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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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