HP302 Homework Assignment 3- Due Wednesday. February 28th by 11:59pm Complete th
ID: 3050997 • Letter: H
Question
HP302 Homework Assignment 3- Due Wednesday. February 28th by 11:59pm Complete the following questions and submit your answers via Blackboard by the due date. The total possible points earned is 41 points. Round all calculated values to 4 decimal points if necessary. The angiogram is the standard test used to diagnose the occurrence of stroke. However, the test is invasive and researchers are looking into an alternative screening test that is non-invasive. One hundresd patients with transient monocular blindness, or TMB (where a person temporarily loses vision in one eye), were given both tests to determine if they have had a stroke. The results for stroke diagnosis were as follows: Angiogram Positive Angiogram Negative Total Non-Invasive Test Positive Non-Invasive Test Negative Total 63 37 100 53 10 30 40 60 Define the screening test as the non-invasive test and the diagnostic test as the Angiogram. For both tests, a positive test indicates positive for a stroke per that test. 1. What is the predictive value positive of the non-invasive test? (3 pts) a. 0.575 b. 0.45 c. 0.6389 d. 0.8413 2. What is the predictive value negative of the non-invasive test? (3 pts) a. 0.8108 b. 0.675 c. 0.6389 d. 0.5 3. What is the specificity of the non-invasive test? (3 pts) a. 0.5 b. 0.75 c. 0.8108 d. 0.675 True or False: Based on your answers for questions 1 and 2, you would recommend using the non-invasive test. (2 pts) What is the prevalence of stroke in the given sample according to the angiogram result? (2 pts) 4. 5. b. 0.6 c. 0.5 d. 0.43Explanation / Answer
1. predictive value positive of non invasive test = =53/63 =
0.84127 . option d.
2.predictive value negative of the non invasive test = 30/37
7.
where,
P[X=x] = nCx px (1-p)n-x
0.84127 . option d.
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