True or False. A test that has a high sensitivity and a high specificity is guaranteed...
Homework Answers
False:
since positive predicted value
=prevalence* sensitivity/(prevalence* sensitivity+(1-prevalence)*(1- specificity))
therefore a small value of prevalence can give a low positive predicted value even the sensitivity and specificity are high
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True or False. A test that has a high sensitivity and a high
specificity is guaranteed...
The DoubleCheckGoldTM HIV 1&2 test has a sensitivity of 99.9% and a specificity of 99.6%. Suppose...
The DoubleCheckGoldTM HIV 1&2 test has a sensitivity of 99.9% and a specificity of 99.6%. Suppose that a particular high-risk population has an HIV prevalence of 10%. a. Suppose that a member of this high-risk population is known to be HIV positive. What is the probability that this person will produce a false negative result using this test? Report the result to the nearest tenth of a percent. b. Compute and interpret the positive predictive value for this test when...
10) Please calculate the Sensitivity and Specificity from the 2 by 2 (Screening Test A). (2...
10) Please calculate the Sensitivity and Specificity from the 2 by 2 (Screening Test A). (2 points) Test + Test- Diseased 100 10 Not Diseased 20 80 Sensitivity Specificity How many false positives are there? (1 point) 12) Please Calculate the Sensitivity and Specificity of Screening Test B (2 points) Not D Test Positive 34 Test Negative 13 If I wanted to limit the number of false positives, which of the two screening tests would be preferred? A or B?...
10) Please calculate the Sensitivity and Specificity from the 2 by 2 (Screening Test A). (2 points) Test + Test- Disea...
10) Please calculate the Sensitivity and Specificity from the 2 by 2 (Screening Test A). (2 points) Test + Test- Diseased 100 10 Not Diseased 20 80 Sensitivity Specificity How many false positives are there? (1 point) 12) Please Calculate the Sensitivity and Specificity of Screening Test B (2 points) Not D Test Positive 34 Test Negative 13 If I wanted to limit the number of false positives, which of the two screening tests would be preferred? A or B?...
Suppose that a certain HIV test has both a sensitivity and specificity of 99.9%. This test...
Suppose that a certain HIV test has both a sensitivity and specificity of 99.9%. This test is applied to a population of 1,000,000 people. Suppose that 6% of the population is actually infected with HIV. (a) Calculate the PPV. Suggestion: First make a table as seen below. (Round your answer to one decimal place.) Has disease Does not have disease Totals Test positive Test negative Totals (b) Calculate the NPV. (Round your answer to three decimal places.) % (C) How...
The screening test for Crohn's has a sensitivity of 80% and a specificity of 90.2%, Assume that t...
The screening test for Crohn's has a sensitivity of 80% and a specificity of 90.2%, Assume that this test s applied to the group of approximately 3.3 million Americans who suffer om symptoms that are very smilar to those of Crohn's. Suppose also that all of the 0.58 million Crohn's sufferers belong to this group. Fill in the following table based on this group of 3.3 million. (Write your answers in millions and round to two decimal places.) Totals Does...
Question 1 2 pts Sensitivity and Specificity are plotted on an ROC Curve. True False Question...
Question 1 2 pts Sensitivity and Specificity are plotted on an ROC Curve. True False Question 2 2 pts To obtain an honest estimate of future classification error, we use the classification matrix that is computed from validation data test data training data Question 3 2 pts The classification matrix, also called confusion matrix, gives estimates of the true classification and misclassification rates. True False Question 4 8 pts A data mining routine has been applied to a transaction dataset...
A new test was compared with a gold standard measurement with the following results Sensitivity Specificity...
A new test was compared with a gold standard measurement with the following results Sensitivity Specificity Positive predictive value Negative predictive value New Test Gold Standard Positive Gold Standard Negative Positive 18 2 Negative 8 72
explain why it is difficult to have a screening test that has 100% sensitivity and specificity....
explain why it is difficult to have a screening test that has 100% sensitivity and specificity. use labeled drawings as appropirate.
In a certain population, the sensitivity of a diagnostic test is 0.80, and the specificity is...
In a certain population, the sensitivity of a diagnostic test is 0.80, and the specificity is 0.90. The prevalence of the disease in the population is 0.10. Use this information to answer Ques- tions 11 to 13. 11. What is the probability of testing negative? (a) 0.17 (b) 0.20 (c) 0.47 (d) • 0.83 12. Among those who have the disease of interest, what is the probability that they test negative? (a) 0.10 (b) • 0.20 (c) 0.47 (d) 0.83...
Calculate the sensitivity, specificity, positive predictive value, and negative predictive value for the Test Screen. &nbs
Calculate the sensitivity, specificity, positive predictive value, and negative predictive value for the Test Screen. Medical Assessment Test Screen Disease No Disease Total Possible Disease 30 20 50 No Disease 10 40 50 Total 40 60 100
10) Please calculate the Sensitivity and Specificity from the 2 by 2 (Screening Test A). (2 points) Test + Test- Diseased 100 10 Not Diseased 20 80 Sensitivity Specificity How many false positives are there? (1 point) 12) Please Calculate the Sensitivity and Specificity of Screening Test B (2 points) Not D Test Positive 34 Test Negative 13 If I wanted to limit the number of false positives, which of the two screening tests would be preferred? A or B?...
10) Please calculate the Sensitivity and Specificity from the 2 by 2 (Screening Test A). (2 points) Test + Test- Diseased 100 10 Not Diseased 20 80 Sensitivity Specificity How many false positives are there? (1 point) 12) Please Calculate the Sensitivity and Specificity of Screening Test B (2 points) Not D Test Positive 34 Test Negative 13 If I wanted to limit the number of false positives, which of the two screening tests would be preferred? A or B?...
Suppose that a certain HIV test has both a sensitivity and specificity of 99.9%. This test is applied to a population of 1,000,000 people. Suppose that 6% of the population is actually infected with HIV. (a) Calculate the PPV. Suggestion: First make a table as seen below. (Round your answer to one decimal place.) Has disease Does not have disease Totals Test positive Test negative Totals (b) Calculate the NPV. (Round your answer to three decimal places.) % (C) How...
The screening test for Crohn's has a sensitivity of 80% and a specificity of 90.2%, Assume that this test s applied to the group of approximately 3.3 million Americans who suffer om symptoms that are very smilar to those of Crohn's. Suppose also that all of the 0.58 million Crohn's sufferers belong to this group. Fill in the following table based on this group of 3.3 million. (Write your answers in millions and round to two decimal places.) Totals Does...
Question 1 2 pts Sensitivity and Specificity are plotted on an ROC Curve. True False Question 2 2 pts To obtain an honest estimate of future classification error, we use the classification matrix that is computed from validation data test data training data Question 3 2 pts The classification matrix, also called confusion matrix, gives estimates of the true classification and misclassification rates. True False Question 4 8 pts A data mining routine has been applied to a transaction dataset...
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